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See detailThe Farrell--Tate and Bredon homology for PSL_4(Z) and other arithmetic groups
Bui, Anh Tuan; Rahm, Alexander UL; Wendt, Matthias

E-print/Working paper (in press)

We provide some new computations of Farrell--Tate and Bredon (co)homology for arithmetic groups. For calculations of Farrell--Tate or Bredon homology, one needs cell complexes where cell stabilizers fix ... [more ▼]

We provide some new computations of Farrell--Tate and Bredon (co)homology for arithmetic groups. For calculations of Farrell--Tate or Bredon homology, one needs cell complexes where cell stabilizers fix their cells pointwise. We provide an algorithm computing an efficient subdivision of a complex to achieve this rigidity property. Applying this algorithm to available cell complexes for PSL_4(Z) and PGL_3(Z[i]) provides computations of Farrell--Tate cohomology for small primes as well as the Bredon homology for the classifying spaces of proper actions with coefficients in the complex representation ring. On the other hand, to check correctness of the computer calculations, we describe the Farrell--Tate cohomology in some rank-one cases, using Brown's complex and a number-theoretic description of the conjugacy classification of cyclic subgroups. [less ▲]

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See detailThe edge-based strain smoothing method for compressible and nearly incompressible non-linear elasticity for solid mechanics
Lee, Chang-Kye; Mihai, L. Angela; Kerfriden, Pierre et al

E-print/Working paper (in press)

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See detailOn the Cohomological Crepant Resolution Conjecture for the complexified Bianchi orbifolds
Perroni, Fabio; Rahm, Alexander UL

E-print/Working paper (in press)

We give formulae for the Chen--Ruan orbifold cohomology for the orbifolds given by a Bianchi group acting on complex hyperbolic 3-space. The Bianchi groups are the arithmetic groups PSL_2(A), where A is ... [more ▼]

We give formulae for the Chen--Ruan orbifold cohomology for the orbifolds given by a Bianchi group acting on complex hyperbolic 3-space. The Bianchi groups are the arithmetic groups PSL_2(A), where A is the ring of integers in an imaginary quadratic number field. The underlying real orbifolds which help us in our study, given by the action of a Bianchi group on real hyperbolic 3-space (which is a model for its classifying space for proper actions), have applications in physics. We then prove that, for any such orbifold, its Chen-Ruan orbifold cohomology ring is isomorphic to the usual cohomology ring of any crepant resolution of its coarse moduli space. By vanishing of the quantum corrections, we show that this result fits in with Ruan's Cohomological Crepant Resolution Conjecture. [less ▲]

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See detailYolanda von Vianden und das Yolanda-Epos
Sieburg, Heinz UL

E-print/Working paper (in press)

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See detailGenuine Bianchi modular forms of higher level, at varying weight and discriminant
Rahm, Alexander UL; Tsaknias, Panagiotis UL

E-print/Working paper (in press)

Bianchi modular forms are automorphic forms over an imaginary quadratic field, associated to a Bianchi group. Even though modern studies of Bianchi modular forms go back to the mid 1960's, most of the ... [more ▼]

Bianchi modular forms are automorphic forms over an imaginary quadratic field, associated to a Bianchi group. Even though modern studies of Bianchi modular forms go back to the mid 1960's, most of the fundamental problems surrounding their theory are still wide open. Only for certain types of Bianchi modular forms, which we will call "generic", it is possible at present to develop dimension formulas: They are (twists of) those forms which arise from elliptic cuspidal modular forms via the Langlands base-change procedure, or arise from a quadratic extension of the imaginary quadratic field via automorphic induction (so-called CM-forms). The remaining, non-"generic" Bianchi modular forms are what we call "genuine", and they are of interest for an extension of the modularity theorem (formerly the Taniyama-Shimura conjecture, crucial in the proof of Femat's Last Theorem) to imaginary quadratic fields. In a preceding paper by Rahm and Sengun, an extreme paucity of "genuine" cuspidal Bianchi modular forms has been reported, but those and other computations and were restricted to level One. In this paper, we are extending the formulas for the "generic" Bianchi modular forms to deeper levels, and we are able to spot the first, rare instances of "genuine" forms at deeper level and heavier weight. [less ▲]

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See detailWhat makes Data Science different? A discussion involving Statistics2.0 and Computational Sciences
Ley, Christophe; Bordas, Stéphane UL

E-print/Working paper (2017)

Data Science is today one of the main buzzwords be it in business, industrial or academic settings. Machine learning, experimental design, data-driven modelling are all, undoubtedly, rising disciplines if ... [more ▼]

Data Science is today one of the main buzzwords be it in business, industrial or academic settings. Machine learning, experimental design, data-driven modelling are all, undoubtedly, rising disciplines if one goes by the soaring number of research papers and patents appearing each year. The prospect of becoming a ``Data Scientist'' appeals to many. A discussion panel organised as part of the European Data Science Conference (European Association for Data Science (EuADS)) asked the question: ``What makes Data Science different?'' In this paper we give our own, personal and multi-facetted view on this question, from an engineering and a statistics perspective. In particular, we compare Data Science to Statistics and discuss the connection between Data Science and Computational Science. [less ▲]

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See detailMigration, Labor Tasks and Production Structure in Europe
Joxhe, Majlinda UL; Borelli, Stefania; Giuseppe, De Arcangelis

E-print/Working paper (2017)

This paper assesses the effect of the immigration on the production structure in a selection of European countries in 2001-2009 with a task-based approach. The inflow of immigrants represents an increase ... [more ▼]

This paper assesses the effect of the immigration on the production structure in a selection of European countries in 2001-2009 with a task-based approach. The inflow of immigrants represents an increase in the relative supply of manual-physical (or simple) tasks, hence favoring simple-task intensive sectors. We use a new OECD dataset, PIAAC, to calculate the index of simple-task intensity at the country-industry level. The analysis confirms that the increase in migration stocks caused a positive impact on the value added of sectors that use more intensively simple tasks. These effects are more intense when considering countries as Italy and Spain characterized by a recent, rapid and intense inflow of migrants. Endogeneity issues are discussed and instruments based on a gravity approach are used in estimation. [less ▲]

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See detailBayesian inference to identify parameters in viscoelasticity
Rappel, Hussein UL; Beex, Lars UL; Bordas, Stéphane UL

E-print/Working paper (2017)

This contribution discusses Bayesian inference (BI) as an approach to identify parameters in viscoelasticity. The aim is to show how the prior influences the identified parameter values in viscoelasticity ... [more ▼]

This contribution discusses Bayesian inference (BI) as an approach to identify parameters in viscoelasticity. The aim is to show how the prior influences the identified parameter values in viscoelasticity when different numbers of measurements are available. The standard linear solid model is the material description of interest and a tensile relaxation test is the experiment focused on. The experimental data are artificially created, allowing us to make a one-to-one comparison between the input parameters and the identified parameter values. The values identified by BI are compared to those identified by the least squares method. [less ▲]

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See detailReal-time Error Control for Surgical Simulation
Bui, Huu Phuoc UL; Tomar, Satyendra UL; Bordas, Stéphane UL

E-print/Working paper (2017)

Real-time simulations are becoming increasingly common for various applications, from geometric design to medical simulation. Two of the main factors concurrently involved in defining the accuracy of ... [more ▼]

Real-time simulations are becoming increasingly common for various applications, from geometric design to medical simulation. Two of the main factors concurrently involved in defining the accuracy of surgical simulations are: the modeling error and the discretization error. Most work in the area has been looking at the above sources of error as a compounded, lumped, overall error. Little or no work has been done to discriminate between modeling error (e.g. needle-tissue interaction, choice of constitutive models) and discretization error (use of approximation methods like FEM). However, it is impossible to validate the complete surgical simulation approach and, more importantly, to understand the sources of error, without evaluating both the discretization error and the modeling error. Our objective is thus to devise a robust and fast approach to measure the discretization error via a posteriori error estimates, which are then used for local remeshing in surgical simulations. To ensure that the approach can be used in clinical practice, the method should be robust enough to deal, as realistically as possible, with the interaction of surgical tools with the organ, and fast enough for real-time simulations. The approach should also lead to an improved convergence so that an economical mesh is obtained at each time step. The final goal is to achieve optimal convergence and the most economical mesh, which will be studied in our future work. [less ▲]

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See detailWealth accumulation over the life course. The role of disadvantages across the employment history
Ponomarenko, Valentina UL

E-print/Working paper (2017)

In this study wealth is employed as an often neglected but highly stratified well-being measure in sociology. I relate the employment history and especially the accumulating disadvantages like ... [more ▼]

In this study wealth is employed as an often neglected but highly stratified well-being measure in sociology. I relate the employment history and especially the accumulating disadvantages like nonemployment and lower occupations to wealth in old age. In particular, I am interested in determining whether an adverse employment history prevents wealth accumulation and which factors influence wealth accumulation across the life course. I use comparative data from the Survey of Health, Ageing and Retirement and combine it with the retrospective panel SHARELIFE to retrieve information about the complete employment history. The relevance of wealth varies significantly across households and in the wider national context. Hence, a contextual perspective is included to account for the difference in wealth rates and wealth inequality in the European countries. The results show that cumulative nonemployment and employment in lower occupations has significant disadvantages for wealth accumulation in old age. However, large differences for men and women persist. Particularly, the household composition and household factors are decisive in the effectuality of these disadvantages. The relation of life course employment and especially disadvantages to accumulated wealth in old aged is stronger in conservative countries than in other welfare regimes. [less ▲]

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See detailQuantum moment maps and retracts for bounded symmetric domains
Korvers, Stéphane UL

E-print/Working paper (2017)

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See detailOn the volume of anti-de Sitter maximal globally hyperbolic three-manifolds
Bonsante, Francesco; Seppi, Andrea; Tamburelli, Andrea UL

E-print/Working paper (2017)

We study the volume of maximal globally hyperbolic Anti-de Sitter manifolds containing a closed orientable Cauchy surface S, in relation to some geometric invariants depending only on the two points in ... [more ▼]

We study the volume of maximal globally hyperbolic Anti-de Sitter manifolds containing a closed orientable Cauchy surface S, in relation to some geometric invariants depending only on the two points in Teichmüller space of S provided by Mess’ parameterization - namely on two isotopy classes of hyperbolic metrics h and h' on S. The main result of the paper is that the volume coarsely behaves like the minima of the L1-energy of maps from (S, h) to (S, h'). The study of Lp-type energies had been suggested by Thurston, in contrast with the well-studied Lipschitz distance. A corollary of our result shows that the volume of maximal globally hyperbolic Anti-de Sitter manifolds is bounded from above by the exponential of (any of the two) Thurston’s Lipschitz asymmetric distances, up to some explicit constants. Although there is no such bound from below, we provide examples in which this behaviour is actually realized. We prove instead that the volume is bounded from below by the exponential of the Weil-Petersson distance. The proof of the main result uses more precise estimates on the behavior of the volume, which is proved to be coarsely equivalent to the length of the (left or right) measured geodesic lamination of earthquake from (S, h) to (S, h'), and to the minima of the holomorphic 1-energy. [less ▲]

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See detailHarnack estimates for a nonlinear parabolic equation under Ricci flow
Li, Yi UL; Zhu, Xiaorui

E-print/Working paper (2017)

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See detailHarnack estimates for a heat-type equation under the geometric flow
Li, Yi UL; Zhu, Xiaorui

E-print/Working paper (2017)

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See detailQuantifying uncertainty in hyperelastic soft tissue models
Hauseux, Paul UL; Hale, Jack UL; Cotin, Stéphane et al

E-print/Working paper (2017)

We present a simple open-source semi-intrusive computational method to propagate uncertainties through hyperelastic models of soft tissues. The proposed method is up to two orders of magnitude faster than ... [more ▼]

We present a simple open-source semi-intrusive computational method to propagate uncertainties through hyperelastic models of soft tissues. The proposed method is up to two orders of magnitude faster than the standard Monte Carlo method. The material model of interest can be altered by adjusting few lines of (FEniCS) code. The method is able to (1) provide the user with statistical confidence intervals on quantities of practical interest, such as the displacement of a tumour or target site in an organ; (2) quantify the sensitivity of the response of the organ to the associated parameters of the material model. We exercise the approach on the determination of a confidence interval on the motion of a target in the brain. We also show that for the boundary conditions under consideration five parameters of the Ogden-Holzapfel-like model have negligible influence on the displacement of the target zone compared to the three most influential parameters. The benchmark problems and all associated data are made available as supplementary material. [less ▲]

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See detailOnline deliberation: state of the art
Kies, Raphaël UL

E-print/Working paper (2017)

In the last decade, the issue of online deliberation (or web-deliberation) has gained an important visibility among the scholars in the domain of political science, political philosophy, political ... [more ▼]

In the last decade, the issue of online deliberation (or web-deliberation) has gained an important visibility among the scholars in the domain of political science, political philosophy, political communication as well as software designers. It corresponds not only to a topic of analysis – that can be broadly defined as the quantitative and qualitative assessment of the political and public debates online - but also to a democratic model of e-democracy, that aims to shape the different political usage of the web according to the deliberative values. A pertinent way to analyze this broad phenomenon is to subdivide its analysis in three sections which content is partly based on updated findings of my book Promises and Limits of web-deliberation. The first section refers to the deliberative theory on which the empirical research is based. The second section deals with the complex issue of operationalizing the deliberative theory. The last section provides an overview of the online deliberative empirical studies that were conducted this last decade by distinguishing three broad research fields: i) The studies that aim at measuring the usage of the political web-debates and the characteristics of the users; ii) The studies that identify and compare the social and political actors that offer possibilities of online debates; iii) The studies assessing the quality of deliberation in different discursive online settings and the ones aiming at defining the factors that could explain variations in web-deliberation. [less ▲]

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See detailRäumliche Identifikationen und Identifizierungen in Grenzregionen. Das Beispiel der Großregion SaarLorLux
Wille, Christian UL

E-print/Working paper (2017)

In diesem Beitrag wird die Bedeutung von nationalen Grenzen für räumliche Identitäten in Grenzregionen analysiert. Dafür wird ein mehrdimensionales Analysemodell entwickelt und am Beispiel der Großregion ... [more ▼]

In diesem Beitrag wird die Bedeutung von nationalen Grenzen für räumliche Identitäten in Grenzregionen analysiert. Dafür wird ein mehrdimensionales Analysemodell entwickelt und am Beispiel der Großregion SaarLorLux gefragt, wie die Einwohner den Raum repräsentieren und wie sie ihre alltagskulturellen Praktiken räumlich organisieren. Außerdem werden räumliche Projektionen im politischen Diskurs aufgedeckt und rekonstruiert, inwiefern diese eine Grundlage bilden für Identifizierungsprozesse. Der Beitrag zeigt, dass nationale Grenzen in den Identifikations- und Identifizierungsvorgängen der Einwohner der Großregion SaarLorLux trotz grenzüberschreitender Verflechtungen eine wichtige Rolle spielen, aber nicht zwangsläufig als starre Ordnungskategorien. [less ▲]

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See detailGeneralized Ricci flow II: Existence for complete noncompact manifolds
Li, Yi UL

E-print/Working paper (2017)

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See detailTo MigrateWith orWithout Ones’ Children in China - That is the Question
Chen, Yiwen UL; Fromentin, Vincent; Salagean, Ioana et al

E-print/Working paper (2017)

Where should Chinese internal migrant parents locate their school-aged children: migrate with them or leave them behind? And should they invest in private education of their children? Empirical evidence ... [more ▼]

Where should Chinese internal migrant parents locate their school-aged children: migrate with them or leave them behind? And should they invest in private education of their children? Empirical evidence based on the 2009 wave of the Rural-Urban Migration Survey in China (RUMiC) data is inconclusive. We use an overlapping generations model to find a theoretical optimum that maximizes parents’ utility which includes the children’s educational performance. Depending on the educational investment parents make and the relocation cost of children, we provide necessary and sufficient conditions for migrant parents to take their children to migrate and whether they should provide their children with private education. As the choices of migrant parents affect not only their children’s human capital accumulation, but also on the economic potential of their descendants, we present both short- and long-term consequences of the parents decision. [less ▲]

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See detailHigher Algebra over the Leibniz Operad
Poncin, Norbert UL

E-print/Working paper (2017)

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See detailThe multi-scale analysis of dynamic transmission volatility of carbon prices
Nsouadi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items in this day ... [more ▼]

The implementation of the EU ETS in 2005 led to the establishment of a price that enables manufacturers to realize the impact of their activities on the environment clean. There are no items in this day, since the creation of the European carbon market, which has focused on the analysis of volatility transmission between different investment horizons. The purpose of this paper is to fill this gap in the literature. we analyze the volatility of the price of carbon quota (EUA), by studying linear and nonlinear causal relationships of wavelet components between the different volatilities that we captured at different time scales. we initially conducted the decomposition of the EUA price volatility at different time-frequency interval using a wavelet approach. Our study will be to examine whether the volatility is transmitted from the high-frequency structure of the carbon price in the low frequency. Our results show an intra-structural dependance in carbon price volatility. We detect instability in the volatility of carbon and observe the existence of a bidirectional relationship from high frequency traders to low frequency traders. Our study showed that high-frequency shocks yields carbon price can have a significant impact beyond their Fontiers and touch the low frequency structure associated with long-term traders [less ▲]

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See detailInequality and Incentives: The Quasi-Natural Experiment of Hungary, 1914-2008
Mavridis, Dimitrios UL; Mosberger, Palma

E-print/Working paper (2016)

We construct the first top income share series of a formerly socialist economy before, during, and after socialism in order to exploit the effect of the quasi-natural experiment of the absence of markets ... [more ▼]

We construct the first top income share series of a formerly socialist economy before, during, and after socialism in order to exploit the effect of the quasi-natural experiment of the absence of markets on incentives. We investigate top income shares dynamics and the sources of income at the upper tail of the income distribution. Within this setup, we study the effect of capital markets and liberalized wage settings on top income shares. Our estimates show that the introduction of wage-setting decentralization during socialism had a role in increasing the skill premium and income inequality in years prior the transition. [less ▲]

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See detailNotes on a Lie algebraic relation
Korvers, Stéphane UL

E-print/Working paper (2016)

We exhibit explicit orthogonal decompositions of every multidimensional restricted root space of a real semi-simple Lie algebra. We then show a link between this result and a radiality property of smooth ... [more ▼]

We exhibit explicit orthogonal decompositions of every multidimensional restricted root space of a real semi-simple Lie algebra. We then show a link between this result and a radiality property of smooth functions on G-homogeneous spaces when G is a real semi-simple Lie group. [less ▲]

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See detailMobbing am Arbeitsplatz in Luxemburg
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2016)

Die ausgeprägte Mobbingprävalenz in Luxemburg hat sich von 2013 zu 2014 insgesamt leicht erhöht. 2015 ist wiederum ein geringfügiger Rückgang zu verzeichnen. Am stärksten von Mobbing betroffen sind ... [more ▼]

Die ausgeprägte Mobbingprävalenz in Luxemburg hat sich von 2013 zu 2014 insgesamt leicht erhöht. 2015 ist wiederum ein geringfügiger Rückgang zu verzeichnen. Am stärksten von Mobbing betroffen sind Arbeitnehmer in der Altersklasse der 16-24 Jährigen. Arbeitnehmer ab 55 Jahre weisen dagegen die geringste Mobbingprävalenz auf. Differenziert nach Geschlecht, Vollzeit/Teilzeit- und Vorgesetztenstatus ergeben sich über die drei Jahre jeweils nur geringfügige Unterschiede zwischen den Gruppen. Insbesondere Mitarbeiter die schon sehr lange (über 20 Jahre) in dem Betrieb arbeiten, sind seltener von Mobbing betroffen. Kleinere Betriebe (1-4 Mitarbeiter) weisen eine relativ geringe Mobbingprävalenz auf. Dagegen ist die Mobbingprävalenz in Betrieben, die Arbeitsstellen abbauen vergleichsweise hoch. Hilfsarbeitskräfte und Manager weisen eine eher geringe, hingegen Arbeitnehmer in Handwerksberufen die höchste Mobbingprävalenz auf. Betriebe, die häufig Aktionen zur Aufklärung von Gesundheitsproblemen durchführen, weisen geringere Mobbingprävalenzen auf, als Betriebe, die dies nie oder nur unregelmäßig tun. Differenziert nach Nationalität zeigt sich über die drei Erhebungsjahre eine etwas höhere Mobbingprävalenz bei Arbeitnehmern mit luxemburgischer und französischer Nationalität. Arbeitnehmer mit deutscher Nationalität weisen dagegen konstant eine geringere Mobbingprävalenz auf. Die Mobbingprävalenz von Arbeitnehmern mit portugiesischer Nationalität steigt von 2013 zu 2014 an, verringert sich 2015 jedoch wieder etwas. [less ▲]

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See detailRemarks on contact and Jacobi geometry
Bruce, Andrew UL; Grabowska, Katarzyna; Grabowski, Janusz

E-print/Working paper (2016)

We present an approach to Jacobi and contact geometry that makes many facts, presented in the literature in an overcomplicated way, much more natural and clear. The key concepts are Kirillov manifolds and ... [more ▼]

We present an approach to Jacobi and contact geometry that makes many facts, presented in the literature in an overcomplicated way, much more natural and clear. The key concepts are Kirillov manifolds and Kirillov algebroids, i.e. homogeneous Poisson manifolds and, respectively, homogeneous linear Poisson manifolds. The difference with the existing literature is that the homogeneity of the Poisson structure is related to a principal GL(1, R)-bundle structure on the manifold and not just to a vector field. This allows for working with Jacobi bundle structures on nontrivial line bundles and drastically simplifies the picture of Jacobi and contact geometry. In this sense, the properly understood concept of a Jacobi structure is a specialisation rather than a generalisation of a Poission structure. Our results easily reduce to various basic theorems of Jacobi and contact geometry when the principal bundle structure is trivial, as well as give new insight in the theory. For instance, we describe the structure of Lie groupoids with a compatible principal G-bundle structure and the ‘integrating objects’ for Kirillov algebroids, define canonical contact groupoids, and show that any contact groupoid has a canonical realisation as a contact subgroupoid of the latter. [less ▲]

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See detailOn different approaches to compute the Chern classes of a tensor product of two vector bundles
Iena, Oleksandr UL

E-print/Working paper (2016)

We compare four different approaches to compute the Chern classes of a tensor product of two vector bundles in terms of the Chern classes of the factors.

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See detailThe Frobenius theorem for Z^n_2-supermanifolds
Covolo, Tiffany UL; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

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See detailAtiyah classes and dg-Lie algebroids for matched pairs
Batakidis, Panagiotis; Voglaire, Yannick UL

E-print/Working paper (2016)

For every Lie pair $(L,A)$ of algebroids we construct a dg-manifold structure on the $\ZZ$-graded manifold $\M=L[1]\oplus L/A$ such that the inclusion $\iota: A[1] \to \M$ and the projection $p:\M\to L[1 ... [more ▼]

For every Lie pair $(L,A)$ of algebroids we construct a dg-manifold structure on the $\ZZ$-graded manifold $\M=L[1]\oplus L/A$ such that the inclusion $\iota: A[1] \to \M$ and the projection $p:\M\to L[1]$ are morphisms of dg-manifolds. The vertical tangent bundle $T^p\M$ then inherits a structure of dg-Lie algebroid over $\M$. When the Lie pair comes from a matched pair of Lie algebroids, we show that the inclusion $\iota$ induces a quasi-isomorphism that sends the Atiyah class of this dg-Lie algebroid to the Atiyah class of the Lie pair. We also show how (Atiyah classes of) Lie pairs and dg-Lie algebroids give rise to (Atiyah classes of) dDG-algebras. [less ▲]

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See detailEndogenous Factor Income Distribution - When Piketty meets Romer -
Irmen, Andreas UL; Tabakovic, Amer UL

E-print/Working paper (2016)

We scrutinize Thomas Piketty’s (2014) theory concerning the relationship between an economy’s long-run growth rate, its capital-income ratio, and its factor income distribution put forth in his recent ... [more ▼]

We scrutinize Thomas Piketty’s (2014) theory concerning the relationship between an economy’s long-run growth rate, its capital-income ratio, and its factor income distribution put forth in his recent book Capital in the Twenty-First Century. We find that a smaller long-run growth rate may be associated with a smaller capital-income ratio. Hence, the key implication of Piketty’s Second Fundamental Law of Capitalism does not hold. In line with Piketty’s theory a smaller long-run growth rate may go together with a greater capital share. However, the mechanics behind this result are the opposite of what Piketty suggests. Our findings obtain in variants of Romer’s (1990) seminal model of endogenous technological change. Here, both the economy’s savings rate and its growth rate are endogenous variables whereas in Piketty’s theory they are both exogenous parameters. Including demographic growth in the spirit of Jones (1995) shows that a smaller growth rate of the economy may imply a lower capital share contradicting a central claim in Piketty’s book. [less ▲]

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See detailA global description of the fine Simpson moduli space of 1-dimensional sheaves supported on plane quartics
Iena, Oleksandr UL

E-print/Working paper (2016)

A global description of the fine Simpson moduli spaces of 1-dimensional sheaves supported on plane quartics is given: we describe the gluing of the Brill-Noether loci described by Drézet and Maican and ... [more ▼]

A global description of the fine Simpson moduli spaces of 1-dimensional sheaves supported on plane quartics is given: we describe the gluing of the Brill-Noether loci described by Drézet and Maican and show that the Simpson moduli space M=M_{4m±1}(P_2) is a blow-down of a blow-up of a projective bundle over a smooth moduli space of Kronecker modules. An easy computation of the Poincaré polynomial of M is presented. [less ▲]

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See detailpopulation Aging and Inventive Activity
Irmen, Andreas UL; Litina, Anastasia UL

E-print/Working paper (2016)

This research empirically establishes and theoretically motivates the hypothesis that population aging has a hump-shaped effect on inventive activity. We estimate this hump-shaped relationship in a panel ... [more ▼]

This research empirically establishes and theoretically motivates the hypothesis that population aging has a hump-shaped effect on inventive activity. We estimate this hump-shaped relationship in a panel of 33 OECD countries over the period 1960-2012. The increasing part of the hump captures the awareness that population aging requires inventive activity to guarantee current and future standards of living. The decreasing part reflects the tendency of aging societies to lose dynamism and the willingness to take risks. Policy-wise our analysis suggests that raising the awareness of individuals about the consequences of population aging may facilitate the adoption of strategies and policies encouraging inventive activity and economic growth. [less ▲]

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See detailMultiscale hedge ratio between the spot and future prices of carbon: Wavelet Based Approach
Nsouadi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

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See detailHybrid mesh/particle meshless method for modeling geological flows with discontinuous transport properties
Bourantas, Georgios UL; Lavier, Luc; van Dam, Tonie UL et al

E-print/Working paper (2016)

In the present paper, we introduce the Finite Difference Method-Meshless Method (FDM-MM) in the context of geodynamical simulations. The proposed numerical scheme relies on the well-established FD method ... [more ▼]

In the present paper, we introduce the Finite Difference Method-Meshless Method (FDM-MM) in the context of geodynamical simulations. The proposed numerical scheme relies on the well-established FD method along with the newly developed “meshless” method and, is considered as a hybrid Eulerian/Lagrangian scheme. Mass, momentum, and energy equations are solved using an FDM method, while material properties are distributed over a set of markers (particles), which represent the spatial domain, with the solution interpolated back to the Eulerian grid. The proposed scheme is capable of solving flow equations (Stokes flow) in uniform geometries with particles, “sprinkled” in the spatial domain and is used to solve convection- diffusion problems avoiding the oscillation produced in the Eulerian approach. The resulting algebraic linear systems were solved using direct solvers. Our hybrid approach can capture sharp variations of stresses and thermal gradients in problems with a strongly variable viscosity and thermal conductivity as demonstrated through various benchmarking test cases. The present hybrid approach allows for the accurate calculation of fine thermal structures, offering local type adaptivity through the flexibility of the particle method. [less ▲]

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See detailUnfairness perceptions at work
Barazzetta, Marta UL; D'Ambrosio, Conchita UL; Clark, Andrew E.

E-print/Working paper (2016)

This works investigates the effect of unfair income on subjective well-being and job quits. Following the fair-wage hypothesis (Akerlof, 1982, Akerlof and Yellen, 1990), empirical evidence has shown that ... [more ▼]

This works investigates the effect of unfair income on subjective well-being and job quits. Following the fair-wage hypothesis (Akerlof, 1982, Akerlof and Yellen, 1990), empirical evidence has shown that individuals change their economic behaviour according to fairness considerations. Another side of the literature, based on the relative income hypothesis (Duesberry, 1949), has provided a large amount of evidence that people do not evaluate outcomes only in absolute terms but also relative to some reference levels. We contribute to these two strands of literature exploring the effect of perceiving own income as unfair on subjective well-being. Using five waves of the German Socio-Economic Panel (SOEP), we find that those who perceive to earn an unfair income have significantly lower subjective well-being, both in terms of cognitive evaluations (life and job satisfaction) and emotional health. The results are robust to the inclusion of both absolute and relative measures of income. The negative effect of unfair pays is translated into a higher probability of quitting the job, confirming the importance of fairness considerations for labour relations. [less ▲]

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See detailWavelet Dynamic Conditional Correlation GARCH model : WDCC-GARCH
Nsaoudi, Ange; Terraza, Virginie UL

E-print/Working paper (2016)

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See detailIntegration on colored supermanifolds
Grabowski, Janusz; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

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See detailDifferential Calculus on Z_2^n Supermanifolds
Covolo, Tiffany; Kwok, Stephen UL; Poncin, Norbert UL

E-print/Working paper (2016)

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See detailBorders : conceptual framework
Roelens, Nathalie UL

E-print/Working paper (2016)

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See detailKrichever-Novikov type algebras and Wess-Zumino-Witten models
Schlichenmaier, Martin UL

E-print/Working paper (2015)

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus and/or the multi-point situation. They play a ... [more ▼]

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus and/or the multi-point situation. They play a very important role in the context of quantization of Conformal Field Theory. In this review we give the most important results about their structure, almost-grading and central extensions. Furthermore, we explain how they are used in the context of Wess--Zumino--Novikov--Witten models, respectively Knizhnik-Zamolodchikov connections. There they play a role as gauge algebras, as tangent directions to the moduli spaces, and as Sugawara operators. [less ▲]

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See detailOn four Koszul-Tate resolutions
Pistalo, Damjan UL; Poncin, Norbert UL

E-print/Working paper (2015)

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See detailValuing American options using fast recursive projections
Cosma, Antonio UL; Galluccio, Stefano; Pederzoli, Paola et al

E-print/Working paper (2015)

We introduce a fast and widely applicable numerical pricing method that uses recursive projections. We characterize its convergence speed. We find that the early exercise boundary of an American call ... [more ▼]

We introduce a fast and widely applicable numerical pricing method that uses recursive projections. We characterize its convergence speed. We find that the early exercise boundary of an American call option on a discrete dividend paying stock is higher under the Merton and Heston models than under the Black-Scholes model, as opposed to the continuous dividend case. A large database of call options on stocks with quarterly dividends shows that adding stochastic volatility and jumps to the Black-Scholes benchmark reduces the amount foregone by call holders failing to optimally exercise by 25%. Transaction fees cannot fully explain the suboptimal behavior. [less ▲]

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See detailN point Virasoro algebras considered as Krichever-Novikov type algebras
Schlichenmaier, Martin UL

E-print/Working paper (2015)

We explain how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and ... [more ▼]

We explain how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied by Schlichenmaier. Using this more general point of view, useful structural insights and an easier access to calculations can be obtained. As example, explicit expressions for the three-point situation are given. This is a write-up of a talk presented at the Bialowieza meeting in 2015. Details can be found in a recent manuscript by the author. [less ▲]

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See detailThe Demand for Diversification in Incomplete Markets
Mehra, Rajnish UL; Wahal, Sunil; Xie, Daruo

E-print/Working paper (2015)

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See detailWeyl type quantization for some symplectic symmetric spaces
Korvers, Stéphane UL

E-print/Working paper (2015)

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See detailN-point Virasoro algebras are multi-point Krichever--Novikov type algebras
Schlichenmaier, Martin UL

E-print/Working paper (2015)

We show how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied ... [more ▼]

We show how the recently again discussed $N$-point Witt, Virasoro, and affine Lie algebras are genus zero examples of the multi-point versions of Krichever--Novikov type algebras as introduced and studied by Schlichenmaier. Using this more general point of view, useful structural insights and an easier access to calculations can be obtained. The concept of almost-grading will yield information about triangular decompositions which are of importance in the theory of representations. As examples the algebra of functions, vector fields, differential operators, current algebras, affine Lie algebras, Lie superalgebras and their central extensions are studied. Very detailed calculations for the three-point case are given. [less ▲]

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See detailPension insecurity and well-being in Europe
Olivera Angulo, Javier UL; Ponomarenko, Valentina UL

E-print/Working paper (2015)

This paper studies pension insecurity in a sample of non-retired individuals aged 50 years or older from 18 European countries. We relate pension insecurity with the subjective expectations on the ... [more ▼]

This paper studies pension insecurity in a sample of non-retired individuals aged 50 years or older from 18 European countries. We relate pension insecurity with the subjective expectations on the probability that the government will reduce the pensions of the individual before retirement or will increase the statutory retirement age. We argue that changes in economic conditions and policy affect the formation of such probabilities, and through this, subjective wellbeing. In particular, we study the effects of pension insecurity on subjective wellbeing with pooled OLS models, regressions per quintiles and instrumental variables. We find a statistically significant, stable and negative association between pension insecurity and subjective wellbeing. The quintile regressions allow us to establish that pension insecurity is more salient for individuals who are poorer, who subjectively assess their life survival rate as low and who have higher cognitive abilities. [less ▲]

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See detailWell-being differences in old-age in Europe: the Active Ageing Index by cohorts
Olivera Angulo, Javier UL

E-print/Working paper (2015)

The goal of this paper is to study and explain the differences in wellbeing in old age across cohorts and countries in Europe. This is done with the replication of the Active Ageing Index for cohorts ... [more ▼]

The goal of this paper is to study and explain the differences in wellbeing in old age across cohorts and countries in Europe. This is done with the replication of the Active Ageing Index for cohorts formed by age group, sex and country for 2012. The analysis is performed with different model regressions at the cohort level and introducing macro variables at the country level. In general, there is a gap in active ageing in detriment of females which is larger in older cohorts. In addition, wealth, equity and pension settings of the country are important predictors for better active ageing. Finally, it is found that the Social-Democratic welfare regime (Nordic countries) with its set of strong redistributive policies, is the most favourable system for active ageing. [less ▲]

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See detailIs Venture Capital really a Local Business? Evidence from U.S. Cross-Border Investment
Kräussl, Roman UL; Wuebker,, Robert; Schulze, William

E-print/Working paper (2015)

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See detailToward a pecking order theory of strategic resource deployment
Kräussl, Roman UL; Schulze, William; Deeds, David et al

E-print/Working paper (2015)

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See detailThe Impact of Uncertainty in the Oil and Gold Market on the Cross-Section
Lehnert, Thorsten UL; Bams, Dennis; Blanchard, Gildas et al

E-print/Working paper (2015)

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See detailOn the Impact of Exclusion Filters Rules in Option Pricing
Lehnert, Thorsten UL; Dennis, Brams; Gildas, Blanchard

E-print/Working paper (2015)

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See detailEuro Crash Risk
Kräussl, Roman UL; Lehnert, Thorsten UL; Sigita, Senulyte

E-print/Working paper (2015)

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See detailOn symbolic computations with Chern classes: remarks on the library chern.lib for Singular
Iena, Oleksandr UL

E-print/Working paper (2015)

We provide an informal overview of the algorithms used for computing with Chern classes in the library chern.lib for the computer algebra system Singular.

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See detailThe “Tone Effect” of News on Investor Beliefs: An Experimental Approach
Kräussl, Roman UL; Bosman,, Ronald; Schulze,, William et al

E-print/Working paper (2015)

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See detailVolatility Concepts and Risk Management Tools
Lehnert, Thorsten UL; Blanchard,, Gildas; Dennis, Bams,

E-print/Working paper (2015)

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See detailFrom Time Varying Risk-Aversion and Sentiment to Anomalies in Market
Lehnert, Thorsten UL; Honarvar, Iman; Bams, Dennis

E-print/Working paper (2015)

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See detailLanguage profiles and practices of cross-border workers in Luxembourg
Franziskus, Anne UL; De Bres, Julia UL

E-print/Working paper (2015)

This paper summarises the findings of a questionnaire study investigating the language pro-files and practices of cross-border workers in Luxembourg. The study was undertaken in 2009 and includes 128 ... [more ▼]

This paper summarises the findings of a questionnaire study investigating the language pro-files and practices of cross-border workers in Luxembourg. The study was undertaken in 2009 and includes 128 cross-border workers from 35 workplaces from different sectors, including the health sector, higher education and research, the manufacturing industry and the service sector. The study suggests that all the participants have a multilingual profile and have learnt at least one language in addition to their first one in the course of their life. A second result is that French is used in all the workplaces under investigation. But, at the same time, the major-ity of the cross-border worker participants have a multilingual professional life, most of them using more than one language at work on an everyday basis. This multilingualism comes in the form of a wide range of multilingual practices, including language accommodation, use of a lingua franca, code-switching and receptive multilingualism. Furthermore, two thirds of the participants report having learnt Luxembourgish either formally or informally, and half of those who have not learnt it, would like to do so in the future. [less ▲]

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See detailIncreases in well-being after transition to retirement for unemployed. Catching up with formerly employed persons.
Ponomarenko, Valentina UL; Leist, Anja UL; Chauvel, Louis UL

E-print/Working paper (2015)

This paper examines the extent to which well-being levels change in the transition to retirement depending on transitioning from being employed, unemployed, or economically inactive. Whereas transitioning ... [more ▼]

This paper examines the extent to which well-being levels change in the transition to retirement depending on transitioning from being employed, unemployed, or economically inactive. Whereas transitioning from employment to unemployment has been found to cause an increase in depressive symptoms or decline in life satisfaction with more time spent in unemployment, it is not clear to which extent transitioning from unemployment to retirement affects well-being levels compared to retiring after being employed or economically inactive. We use two waves of the Survey of Health, Ageing and Retirement in Europe monitoring respondents transitioning to retirement and use life satisfaction as well-being measure. The effect of the transition is captured with a difference-in-difference like approach to test if the change in well-being after retirement is different for persons who were formerly unemployed or inactive, respectively, compared to formerly employed retirees. Results indicate that retiring from unemployment is associated with an increase in life satisfaction, but presents mainly a catching-up effect compared to employed persons transitioning to retirement. Retirement from labour market inactivity, especially sick leave, does not lead to significant changes in well-being. Findings are robust to selection into unemployment and country differences. As well-being of unemployed persons recovers after transitioning to retirement, especially the currently unemployed population should be supported to prevent detrimental consequences of economically unfavourable conditions and lower well-being. [less ▲]

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See detailMultilingualism in advertising and a shifting balance of languages in Luxembourg
De Bres, Julia UL

E-print/Working paper (2015)

Much research on multilingualism in advertising has been undertaken in comparatively mono-lingual settings. Whereas such research may provide insights into the connotations of lan-guages used in ... [more ▼]

Much research on multilingualism in advertising has been undertaken in comparatively mono-lingual settings. Whereas such research may provide insights into the connotations of lan-guages used in advertising, research in more multilingual contexts can also provide different kinds of insights regarding the relative status of languages in a multilingual environment. This article focuses on multilingualism in written advertising in the highly multilingual setting of Luxembourg, where the language situation is currently undergoing significant change due to patterns of globalisation and migration. Analysis of a mixed corpus of advertisements, includ-ing 1,038 advertisements in the free daily newspaper l’Essentiel from 2009 to 2011, as well as selected further advertisements from elsewhere within Luxembourg’s linguistic landscape, reflects a move within Luxembourg in general from a longstanding trilingualism in French, German and Luxembourgish to different kinds of multilingualism, incorporating both the presence of new languages and changes in the relative roles of French, German and Luxem-bourgish. Particularly significant is the presence of Luxembourgish as a written language of advertising, whereas it traditionally functioned mainly as a spoken language in Luxembourg. The article presents the results of a quantitative and qualitative analysis of the advertisements and discusses how multilingualism in written advertising provides a pertinent window on changing forms of multilingualism in Luxembourg. [less ▲]

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See detailEspaces de frontière. Penser et analyser la frontière en tant qu’espace
Wille, Christian UL

E-print/Working paper (2015)

Les frontières se différencient non seulement en fonction des domaines d'étude où elles sont opérantes ou dans lesquels elles se constituent, mais également en termes de modes de (re)production et de ... [more ▼]

Les frontières se différencient non seulement en fonction des domaines d'étude où elles sont opérantes ou dans lesquels elles se constituent, mais également en termes de modes de (re)production et de formes. Cette communication traitera en premier lieu de la forme de la frontière, sachant que ce n’est pas la frontière territoriale en tant que ligne qui importera, mais plutôt son caractère zonal et la question de savoir comment il est possible de l'aborder dans une perspective théorico-conceptuelle aux fins de l’étude empirique. Il est plus judicieux de considérer les frontières territoriales comme zones ou espaces, la métaphore de la ligne s'avérant une pure fiction. Jusqu’au XVIIIe siècle, les frontières étaient conçues comme des espaces de contact et des zones de transition (convoitées), ce n’est qu’avec l’avènement d’États nationaux modernes que s’établit le concept de frontière comme ligne – sans qu’elle n’ait perdu empiriquement son caractère zonal. C’est ce qu’on peut notamment constater dans les régions transfrontalières où les frontières territoriales ne peuvent se réduire à leur fonction de différenciation ou de passerelle, mais au contraire s’élargissent – comme le montre la mobilité transfrontalière des travailleurs, des consommateurs ainsi que la mobilité résidentielle – se transformant ainsi en zones de l'entre-deux. Ces zones ne peuvent pas être concédées aux espaces situés en deçà et au-delà d’une frontière territoriale, elles représentent en revanche des espaces autonomes, lesdits « espaces de frontière » qui revêtent une identité liminale. L'objet de cette communication est de savoir comment il est possible de décrire et d'étudier de tels espaces que l'on peut observer comme productions quotidiennes. Il s’agit (1) de percevoir de manière conceptuelle le caractère zonal de la frontière, donc la dimension spatiale, (2) le potentiel innovateur et imprévisible de la liminalité et ainsi la contingence sociale. La géographie sociale et la sociologie de la culture en livrent des points de départ pertinents. La mise en relation d’approches concernant l’espace et la pratique sociale issues de ces deux disciplines représente la base du modèle « espaces de frontière » qui permet de penser les frontières en tant qu’espaces et met en place une heuristique destinée à l’étude de constitutions spatiales centrées sur le sujet comme (re)productions des frontières. Les pratiques sociales, la connaissance pratique ainsi que les aspects physico-matériels et socio-structurels tels qu'ils sont appropriés et engendrés par les « frontaliers » dans des références transfrontalières, font partie des catégories d'analyse. [less ▲]

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See detailIntercultural work environments in Luxembourg. Multilingualism and cultural diversity among cross-border workers at the workplace
Wille, Christian UL; De Bres, Julia UL; Franziskus, Anne

E-print/Working paper (2015)

The trilingual country of Luxembourg accounts for the highest percentage of cross-border workers in the European Union. These workers commute daily from France, Belgium and Germany to Luxembourg. Their ... [more ▼]

The trilingual country of Luxembourg accounts for the highest percentage of cross-border workers in the European Union. These workers commute daily from France, Belgium and Germany to Luxembourg. Their presence in the national labour market results in increasing linguistic and cultural diversity at Luxembourgish workplaces. Drawing upon interview and interactional data, the present contribution is the first to investigate how cross-border workers in Luxembourg perceive and deal with multilingualism and interculturality, and presents a range of related linguistic and intercultural practices. [less ▲]

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See detailInternational vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung
Wille, Christian UL; von der Wense, Edwina; Heimböckel, Dieter UL

E-print/Working paper (2015)

Die vorliegende vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung wurde im Zuge der Einrichtungen des fakultären Schwerpunktbereichs MIS – Mehrsprachigkeit ... [more ▼]

Die vorliegende vergleichende Analyse von Einrichtungen und Arbeitszusammenhängen der Interkulturalitätsforschung wurde im Zuge der Einrichtungen des fakultären Schwerpunktbereichs MIS – Mehrsprachigkeit und Interkulturelle Studien durchgeführt. Ziel war es zentrale Orientierungspunkte für eine strategische Positionierung und für zukünftige Entwicklungslinien des Schwerpunktbereichs zu gewinnen. Dafür wurden die Internetseiten von 64 vergleichbaren Einrichtungen bzw. Arbeitszusammenhängen der Interkulturalitätsforschung inhaltsanalytisch untersucht. Zur Stichprobe zählen in erster Linie eigenständige Zentren und Institute/Abteilungen aus dem universitären Kontext mit international breit gestreuten Standorten; Arbeitszusammenhänge bzw. Einrichtungen aus dem deutschsprachigen Raum sind besonders gut vertreten. [less ▲]

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See detailMonetary Policy with 100% Reserve Banking: An Exploration
Mehra, Rajnish UL; Wessel, Ryan; Prescott, Edward C.

E-print/Working paper (2015)

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See detailThe determinants of CoCo bond prices
Wolff, Christian UL

E-print/Working paper (2015)

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See detailDoes the CAMEL bank rating system follow a pro-cyclical pattern?
Wolff, Christian UL

E-print/Working paper (2015)

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See detailCredit risk characteristics of US small business portfolios
Wolff, Christian UL

E-print/Working paper (2015)

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See detailWohnmobilität in der Großregion - eine interurbane Diskursanalyse
Christmann, Nathalie UL

E-print/Working paper (2015)

“Je t’aime, moi non plus” : this is how the French newspaper L’Express (2011, p. II) summarises the transnational linkages of Luxembourg with its neighbouring countries. On the one hand, the ‘economic ... [more ▼]

“Je t’aime, moi non plus” : this is how the French newspaper L’Express (2011, p. II) summarises the transnational linkages of Luxembourg with its neighbouring countries. On the one hand, the ‘economic engine’ Luxembourg offers workplaces for many commuters, positively affecting the development of this European cross-border polycentric metropolitan region; on the other hand, negative consequences such as the overcrowded real estate mar-ket in Luxembourg continue beyond the national border and affect neighbouring housing markets. The ‘2020 Concept for the Region Trier’ shows that city councils perceive the prox-imity to Luxembourg as an opportunity for the development of the city. Simultaneously, lo-cals might feel displaced due to increasing rents and house prices, and develop resentment vis-à-vis their new neighbours, coming either from Luxembourg, or being Belgian, German or French nationals (labour migrants) that have moved to the border region to work in the Grand Duchy of Luxembourg, thus disposing of higher purchase power. Depending on the context, similar effects can thus be perceived very differently by city councils or planners and the local population. So far, studies dealing with the processes of transmigration have mostly focussed on indi-vidual motives of migrants, whereas impacts on the regions of destination have not been explored. The aim of this study is to explore ongoing discourses dealing with spatial impacts in relation to urban housing markets within the Greater Region. The focus will be on the cit-ies Arlon (BE), Metz and Thionville (FR), and Trier (DE). Therefore mixed methods will be de-ployed. Firstly, a quantitative analysis is planned to reveal the magnitude and the spatial distribution of the (cross-border) residential mobility. The evolution of housing prices and rents as well as population dynamics will be examined. Secondly, ongoing discourses and the changes of life-worlds will be studied using quantitative methods as well as qualitative methods, such as content analysis, to review the guiding principles of municipal policy and urban planning documents. A quantitative analysis of local newspapers will be conducted to analyse public opinion. A content analysis of this material will follow. The method mix allows us to better understand “material” evolutions and to trace the current discourses within this field. Discourse approaches have become common in interdis-ciplinary social science academic research. However, there are no established theoretical and methodological guidelines for applying these approaches. This project has to deal with this situation and to take into account different cultural backgrounds and discussion levels. This study will help to frame today’s situation and aims to develop sustainable solutions for future urban planning. [less ▲]

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See detailHedonic adaptation to a treatment. Evidence from a medical intervention
Barazzetta, Marta UL; Appleton, Simon; Owens, Trudy

E-print/Working paper (2015)

We investigate adaptation of subjective well-being using a randomized controlled trial. We find that providing medical equipment to a random sample of Ugandan adults with lower limb disabilities has a ... [more ▼]

We investigate adaptation of subjective well-being using a randomized controlled trial. We find that providing medical equipment to a random sample of Ugandan adults with lower limb disabilities has a positive effect on their physical health, using both objective and self-reported measures. Treated patients experience a significant improvement in life satisfaction initially, but the effect is not prolonged. After one year, life satisfaction returns to the pre-treatment level, supporting the hypothesis of adaptation. This evidence of adaptation is supported by observations of changes in aspirations and expectations and is robust to alternative estimation methods including instrumental variable estimation and ITT analysis. [less ▲]

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See detailLie superalgebras of Krichever-Novikov type
Schlichenmaier, Martin UL

E-print/Working paper (2014)

Classically, starting from the Witt and Virasoro algebra important examples of Lie superalgebras were constructed. In this write-up of a talk presented at the Bia\l owie\.za meetings we report on results ... [more ▼]

Classically, starting from the Witt and Virasoro algebra important examples of Lie superalgebras were constructed. In this write-up of a talk presented at the Bia\l owie\.za meetings we report on results on Lie superalgebras of Krichever-Novikov type. These algebras are multi-point and higher genus equivalents of the classical algebras. The grading in the classical case is replaced by an almost-grading. It is induced by a splitting of the set of points, were poles are allowed, into two disjoint subsets. With respect to a fixed splitting, or equivalently with respect to a fixed almost-grading, it is shown that there is up to rescaling and equivalence a unique non-trivial central extension of the Lie superalgebra of Krichever--Novikov type. It is given explicitly. [less ▲]

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See detailIs Abatement Effective in the Presence of Corruption? A Theoretical Exploration
Litina, Anastasia UL; Sartzetakis, Eftichis; Lapatina, Athanasios

E-print/Working paper (2014)

The paper introduces an additional channel via which corruption may adversely affect environmental quality. It is argued that, in the presence of corruption, politicians may allocate a large fraction of ... [more ▼]

The paper introduces an additional channel via which corruption may adversely affect environmental quality. It is argued that, in the presence of corruption, politicians may allocate a large fraction of public funds to environmental projects aiming not at improving environmental quality, but rather at increasing their ability to extract rents. This type of behavior has a direct and an indirect effect on environmental quality. First, due to extensive rent-seeking, the effectiveness of environmental projects is disproportional to the amount of public funds allocated to them. Second, citizens who observe the poor outcome of environmental projects, increase tax evasion thus reducing public funds. A vicious circle of extensive tax evasion and rent seeking activities emerges, that has a detrimental effect on environmental quality. Anecdotal evidence from a number of countries that experience high levels of corruption, shows little or no improvements in environmental quality despite the implementation of environmental projects. In line with our theoretical findings, this ineffectiveness of the environmental policy is present even when the technology involved is advanced. [less ▲]

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See detailEmergence of Sovereign Wealth Funds
Carpantier, Jean-Francois UL; Vermeulen, Wessel UL

E-print/Working paper (2014)

This paper tests the theoretically founded hypothesis that the surge of SWF establishments is determined by three main factors: 1) the existence of natural resources profits, 2) the government structure ... [more ▼]

This paper tests the theoretically founded hypothesis that the surge of SWF establishments is determined by three main factors: 1) the existence of natural resources profits, 2) the government structure and 3) the ability to invest usefully in the domestic economy. We test this hypothesis on a sample of 20 countries that established an SWF in the period 1998-2008 by comparing them to the roughly 100 countries that did not set up a fund in the same period. We find evidence for all three factors. The results suggest that SWFs tend to be established in countries that run an autocratic regime and have difficulties finding suitable opportunities for domestic investments. We do not find the net foreign asset position of a country to be similarly related to the explanatory variables, indicating that the establishment of an SWF is distinct from a national accounting result. We argue that our results indicate that it is relevant to study how an SWF interacts with the domestic economy and government policy. [less ▲]

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See detailNon-optimal levels of a reducible mod l modular representation
Yoo, Hwajong UL

E-print/Working paper (2014)

Let $ell>3$ be a prime and $N$ is a square-free integer prime to $\ell$. For each prime divisor $p$ of $N$, let $a_p$ is either 1 or -1. We give a sufficient criterion for the existence of a newform $f ... [more ▼]

Let $ell>3$ be a prime and $N$ is a square-free integer prime to $\ell$. For each prime divisor $p$ of $N$, let $a_p$ is either 1 or -1. We give a sufficient criterion for the existence of a newform $f$ of weight 2 for $\Gamma_0(N)$ such that the mod $\ell$ Galois representation attached to $f$ is reducible and $U_p f= a_p f$ for prime divisors $p$ of $N$. The main techniques used are level raising methods based on an exact sequence due to Ribet. [less ▲]

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See detailKrichever-Novikov type algebras. An Introduction
Schlichenmaier, Martin UL

E-print/Working paper (2014)

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus. We give the most important results about their ... [more ▼]

Krichever--Novikov type algebras are generalizations of the Witt, Virasoro, affine Lie algebras, and their relatives to Riemann surfaces of arbitrary genus. We give the most important results about their structure, almost-grading and central extensions. This contribution is based on a sequence of introductory lectures delivered by the author at the Southeast Lie Theory Workshop 2012 in Charleston, U.S.A. [less ▲]

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See detailO cérebro multilingue
Engel de Abreu, Pascale UL

E-print/Working paper (2014)

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See detailImproved Modular Multiplication for Optimal Prime Fields
Seo, Hwajeong; Liu, Zhe UL; Nogami, Yasuyuki et al

E-print/Working paper (2014)

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See detailThe free Courant algebroid
Jubin, Benoît Michel UL; Poncin, Norbert UL; Uchino, Kyousuke

E-print/Working paper (2014)

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See detailCorruption, Tax Evasion and Social Values
Litina, Anastasia UL; Palivos, Theodore

E-print/Working paper (2014)

We provide empirical support and a theoretical explanation for the vicious circle of political corruption and tax evasion in which countries often fall into. We address this issue in the context of a ... [more ▼]

We provide empirical support and a theoretical explanation for the vicious circle of political corruption and tax evasion in which countries often fall into. We address this issue in the context of a model with two distinct groups of agents: citizens and politicians. Citizens decide the fraction of their income for which they evade taxes. Politicians decide the fraction of the public budget that they peculate. We show that multiple self-fulfilling equilibria with different levels of corruption can emerge based on the existence of strategic complementarities, indicating that corruption may corrupt. Furthermore, we find that standard deterrence policies cannot eliminate multiplicity. Instead, policies that impose a strong moral cost on tax evaders and corrupt politicians can lead to a unique equilibrium. [less ▲]

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See detailReflections upon the Interaction between Domestic and European Personal Data Protection Legislation
Pelin Raducu, Ioana UL

E-print/Working paper (2014)

This paper assesses whether the European legislative reform on the protection of personal data, in conjunction with national law, responds in a satisfactory manner to the challenges posed by technological ... [more ▼]

This paper assesses whether the European legislative reform on the protection of personal data, in conjunction with national law, responds in a satisfactory manner to the challenges posed by technological evolution and widespread use of Internet. In recent years, the question of State regulation of the processing of personal data by private companies has become urgent as allegations of unauthorized access to personal data have been hotly debated in the European press. Thus, the paper shall first analyse, the appropriateness of European and States' legislation to properly regulate the effective protection of personal data, in particular of obligations applicable to companies storing and processing personal data on European soil. Does the proposed European legislation in the context of the EU's international agreements with the US provide sufficient legal safeguards to ensure the effective protection of personal data in the post-Snowden era? Specific subparts are devoted to the European reform of companies' criminal liability in cases of cyber-attack (a) and of specific obligations imposed on providers of cloud computing services (b). In the second part, I comment on the interpretation of the European data-protection legislation, provided by the Court of Justice, regarding the obligations imposed upon 'intermediaries' that process personal data, such as the Internet service providers (a) and Internet search engines (b). The Court of Justice has interpreted the European legislation in a manner that allows courts and national authorities to impose on companies a set of safeguards to protect individuals against the infringement of copyright and privacy rights. [less ▲]

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See detailA hybrid T-Trefftz polygonal finite element for linear elasticity
Bhattacharjee, Kalyan; Natarajan, Sundararajan; Bordas, Stéphane UL

E-print/Working paper (2014)

In this paper, we construct hybrid T-Trefftz polygonal finite elements. The displacement field within the polygon is repre- sented by the homogeneous solution to the governing differential equation, also ... [more ▼]

In this paper, we construct hybrid T-Trefftz polygonal finite elements. The displacement field within the polygon is repre- sented by the homogeneous solution to the governing differential equation, also called as the T-complete set. On the boundary of the polygon, a conforming displacement field is independently defined to enforce continuity of the displacements across the element boundary. An optimal number of T-complete functions are chosen based on the number of nodes of the polygon and degrees of freedom per node. The stiffness matrix is computed by the hybrid formulation with auxiliary displacement frame. Results from the numerical studies presented for a few benchmark problems in the context of linear elasticity shows that the proposed method yield highly accurate results. [less ▲]

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See detailSuccessful Ageing and Poverty: The case of Peru
Olivera Angulo, Javier UL; Tournier, Isabelle UL

E-print/Working paper (2014)

This study investigated the determinants of Successful Ageing (SA) in a sample of 4,151 Peruvians aged between 65 and 80 and living in poverty. The data correspond to the ESBAM survey, which is the ... [more ▼]

This study investigated the determinants of Successful Ageing (SA) in a sample of 4,151 Peruvians aged between 65 and 80 and living in poverty. The data correspond to the ESBAM survey, which is the baseline to evaluate the non-contributory public pension program Pension 65. A key contribution of this study is to combine the conceptual appealing of Successful Ageing to measure well-being in old-age with the multidimensional poverty counting approach developed in the economic literature. This setting allows for moving beyond the dichotomy of the SA literature (success or usual ageing) and take advantage of the full distribution of success along the set of dimensions of well-being. Nine indicators of SA have been used to assess the dimensions of physical health, functioning, cognition, emotional health, and life satisfaction. The variables associated with a higher number of satisfied indicators were being a male, younger, literate, working, low food insecurity, good nutritional status, normal blood pressure, absence of disabilities, not smoking, empowerment, good self-esteem, absence of mental disability, and less frequent contact with a social network. From a policy perspective, the results of this study report a remarkably stable effect of three variables affecting SA that can be relatively easy to measure, monitor and affect by public intervention. These variables are food security, nutrition quality, and self-esteem. [less ▲]

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See detailTowards Dialogue Games for the Down-Admissible and Up-Complete Procedures
Caminada, Martin; Booth, Richard UL

E-print/Working paper (2014)

Recently, two operators - the down-admissible and up-complete operators - have been proposed, in the context of aggregating argument labellings, for repairing a given initial labelling so that it becomes ... [more ▼]

Recently, two operators - the down-admissible and up-complete operators - have been proposed, in the context of aggregating argument labellings, for repairing a given initial labelling so that it becomes rational, in the sense that it respects the attack relation between the arguments. The purpose of this research note is to give some initial thoughts on defining dialogue games for each of them, as well as for their combination. [less ▲]

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See detailHedge Fund Return Dynamics: long memory and regime switching
LIMAM, mohamed-Ali; Terraza, Virginie UL

E-print/Working paper (2014)

This paper investigates the dynamics of hedge fund returns and their behavior of persistence in a unified framework through the Markov Switching ARFIMA model of Härdle and Tsay (2009). Major results based ... [more ▼]

This paper investigates the dynamics of hedge fund returns and their behavior of persistence in a unified framework through the Markov Switching ARFIMA model of Härdle and Tsay (2009). Major results based on the CSFB/Tremont hedge fund indexes monthly data during the period 1994-2012, highlight the importance of the long memory parameter magnitude i.e shocks in shaping hedge fund return dynamics and show that the hedge fund dynamics are characterized by two levels of persistence: in the first one, associated to low-volatility regime, hedge fund returns are a stationary long memory process whereas in the second one, associated to high-volatility regime, returns exhibit higher parameter of fractional integration. More precisely, in high volatility regime i.e periods of turmoil, the process tends to be non-stationary but still exhibits a mean-reverting behavior. The findings are interesting and enable us to establish a relationship between hedge fund return states and memory phenomenon. [less ▲]

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See detailSkewness Term Structure Tests
Lehnert, Thorsten UL; Lin, Yuehao UL

E-print/Working paper (2014)

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See detailD’méisproochegt Gehir
Engel de Abreu, Pascale UL

E-print/Working paper (2014)

Den „kognitive Virdeel“ vun der Méisproochegkeet besteet doranner, datt méisproocheg Kanner a bestëmmte kognitiven Aufgaben, déi déi sougenannten „Exekutivfunktioune“ moossen, besser si wéi Kanner, déi ... [more ▼]

Den „kognitive Virdeel“ vun der Méisproochegkeet besteet doranner, datt méisproocheg Kanner a bestëmmte kognitiven Aufgaben, déi déi sougenannten „Exekutivfunktioune“ moossen, besser si wéi Kanner, déi nëmmen eng Sprooch schwätzen. [less ▲]

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See detailIntervals of the homomorphism order of graphs have infinite width
Lehtonen, Erkko; Schölzel, Karsten UL

E-print/Working paper (2014)

The homomorphism order of graphs is known to be dense with a single exception. We strengthen this result by showing that, with this single exception, the interval between any two distinct comparable ... [more ▼]

The homomorphism order of graphs is known to be dense with a single exception. We strengthen this result by showing that, with this single exception, the interval between any two distinct comparable graphs includes an infinite antichain. Moreover, every antichain included in such an interval can be extended into an infinite one within that interval. [less ▲]

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See detailCDS Contracts versus Put Options: A robust relationship?
Bekkour, Lamia UL; Lehnert, Thorsten UL; Desimone, Francisco Nadal et al

E-print/Working paper (2014)

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See detailOn capital stocks related to reciprocal shareholdings
Petritz, Erika; Schwaiger, Jens; Tomaschek, Jörg UL

E-print/Working paper (2014)

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See detailThe 2011 European Short Sale Ban: An Option Market Perspective
Kräussl, Roman UL

E-print/Working paper (2014)

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See detailNews Media Sentiment and Investor Behavior
Kräussl, Roman UL; Mirgorodskaya, Elizaveta

E-print/Working paper (2014)

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See detailAutomorphisms and reduction of Heegner points on Shimura curves at Cerednik-Drinfeld primes
Molina Blanco, Santiago UL; Rotger, Victor

E-print/Working paper (2014)

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See detailRisk and Expected Returns of Private Equity Investments: Evidence Based on Market Prices
Kräussl, Roman UL; Jegadeesh, Jegadeesh; Pollet, Joshua M.

E-print/Working paper (2014)

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See detailIs there a Bubble in the Art Market?
Kräussl, Roman UL; Lehnert, Thorsten UL; Martelin, Nicolas

E-print/Working paper (2014)

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See detailZ_2^n-Supergeometry I: Manifolds and Morphisms
Covolo, Tiffany UL; Grabowski, Janusz; Poncin, Norbert UL

E-print/Working paper (2014)

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See detailZ_2^n-Supergeometry II: Batchelor-Gawedzki Theorem
Covolo, Tiffany UL; Grabowski, Janusz; Poncin, Norbert UL

E-print/Working paper (2014)

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See detailEmotions-at-Risk: An Experimental Investigation into Emotions, Option Prices and Risk Perception
Kräussl, Roman UL; Bosman, Ronald; van Galen, Thomas

E-print/Working paper (2014)

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See detailLe cerveau multilingue
Engel de Abreu, Pascale UL

E-print/Working paper (2014)

«L’avantage cognitif» du multilinguisme, décrit le fait que les enfants multilingues accomplissent mieux des tâches cognitives dans le domaine des «fonctions exécutives» que les enfants qui ne parlent ... [more ▼]

«L’avantage cognitif» du multilinguisme, décrit le fait que les enfants multilingues accomplissent mieux des tâches cognitives dans le domaine des «fonctions exécutives» que les enfants qui ne parlent qu’une seule langue. [less ▲]

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