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ORBi

On Farrell-Tate cohomology of SL_2 over S-integers Rahm, Alexander ; E-print/Working paper (in press) Detailed reference viewed: 14 (0 UL)The maximum number of systoles for genus two Riemann surfaces with abelian differentials ; Parlier, Hugo E-print/Working paper (2017) This article explores the length and number of systoles associated to holomorphic $1$-forms on surfaces. In particular, we show that up to homotopy, there are at most $10$ systolic loops on such a genus ... [more ▼] This article explores the length and number of systoles associated to holomorphic $1$-forms on surfaces. In particular, we show that up to homotopy, there are at most $10$ systolic loops on such a genus two surface and that the bound is realized by a unique translation surface up to homothety. We also provide sharp upper bounds on the the number of homotopy classes of systoles for a holomorphic $1$-form with a single zero in terms of the genus. [less ▲] Detailed reference viewed: 9 (1 UL)Images of Galois representations in mod p Hecke algebras Amoros Carafi, Laia E-print/Working paper (2017) Detailed reference viewed: 6 (0 UL)C’était extrêmement violent» Il y a 100 ans, la révolution de Février a provoqué la fin de l’Empire russe Paravantis, Spero E-print/Working paper (2017) La révolution de Février, qui s'est déroulée du 8 mars (23 février) 1917 au 13 mars (28 février) 1917, marque le début de la révolution russe de 1917. Elle force l'abdication du tsar Nicolas II et ... [more ▼] La révolution de Février, qui s'est déroulée du 8 mars (23 février) 1917 au 13 mars (28 février) 1917, marque le début de la révolution russe de 1917. Elle force l'abdication du tsar Nicolas II et provoque la fin de l'Empire russe. Un gouvernement provisoire dirige, mais la même année, la révolution d'Octobre met au pouvoir des bolcheviks et permet la création de l'Union des républiques socialistes soviétiques (URSS). Le chercheur au «Centre for Contemporary and Digital History» à l’Université du Luxembourg, Dr. Spero S.Z. Paravantis nous détaille ce chapitre de l’histoire. [less ▲] Detailed reference viewed: 8 (4 UL)Wohlbefinden von Arbeitnehmern in Luxemburg Sischka, Philipp ; Steffgen, Georges E-print/Working paper (2017) Vergleicht man die Teilnehmer der Quality of Work Index Luxembourg Umfrage mit anderen europäischen Arbeitnehmern, zeigen die Teilnehmer aus Luxemburg im Durchschnitt ein geringeres Wohlbefinden ... [more ▼] Vergleicht man die Teilnehmer der Quality of Work Index Luxembourg Umfrage mit anderen europäischen Arbeitnehmern, zeigen die Teilnehmer aus Luxemburg im Durchschnitt ein geringeres Wohlbefinden. Insbesondere jüngere Arbeitnehmer weisen ein tendenziell geringeres Wohlbefinden auf. Differenziert man die Arbeitnehmer nach Berufsgruppen, zeigen Manager und Führungskräfte, Arbeitnehmer in Dienstleistungsberufen sowie Hilfsarbeitskräfte das höchste Wohlbefinden. Arbeitnehmer mit geringeren faktischen Wochenstundenzahlen sowie Arbeitnehmer, die in kleinen Betrieben (1-4 Beschäftigte) arbeiten, berichten über ein höheres Wohlbefinden. Das Wohlbefinden ist hierbei nachweislich mit unterschiedlichen Arbeitsbedingungen assoziiert. So weisen Arbeitnehmer, je höher ihre Partizipation, ihre Rollenklarheit bei der Arbeit sowie ihre Arbeitsplatzsicherheit ist umso ein höheres Wohlbefinden auf. Das Wohlbefinden ist außerdem positiv mit Arbeitszufriedenheit, wahrgenommenem Respekt bei der Arbeit und negativ mit Stress und Burnout korreliert. [less ▲] Detailed reference viewed: 18 (8 UL)How did the ECB become a fully-fledged central bank of the eurozone? Gren, Jakub E-print/Working paper (2017) Detailed reference viewed: 39 (4 UL)Evaluating How Child Allowances and Daycare Subsidies Affect Fertility ; Koulovatianos, Christos ; et al E-print/Working paper (2017) We compare the cost effectiveness of two pronatalist policies: (a) child allowances; and (b) daycare subsidies. We pay special attention to estimating how intended fertility (fertility before children are ... [more ▼] We compare the cost effectiveness of two pronatalist policies: (a) child allowances; and (b) daycare subsidies. We pay special attention to estimating how intended fertility (fertility before children are born) responds to these policies. We use two evaluation tools: (i) a dynamic model on fertility, labor supply, outsourced childcare time, parental time, asset accumulation and consumption; and (ii) randomized vignette-survey policy experiments. We implement both tools in the United States and Germany, finding consistent evidence that daycare subsidies are more cost effective. Nevertheless, the required public expenditure to increase fertility to the replacement level might be viewed as prohibitively high. [less ▲] Detailed reference viewed: 9 (0 UL)Bayesian inference for the stochastic identification of elastoplastic material parameters: Introduction, misconceptions and insights Rappel, Hussein ; Beex, Lars ; Hale, Jack et al E-print/Working paper (2017) We discuss Bayesian inference (BI) for the probabilistic identification of material parameters. This contribution aims to shed light on the use of BI for the identification of elastoplastic material ... [more ▼] We discuss Bayesian inference (BI) for the probabilistic identification of material parameters. This contribution aims to shed light on the use of BI for the identification of elastoplastic material parameters. For this purpose a single spring is considered, for which the stress-strain curves are artificially created. Besides offering a didactic introduction to BI, this paper proposes an approach to incorporate statistical errors both in the measured stresses, and in the measured strains. It is assumed that the uncertainty is only due to measurement errors and the material is homogeneous. Furthermore, a number of possible misconceptions on BI are highlighted based on the purely elastic case. [less ▲] Detailed reference viewed: 123 (32 UL)Chromatic numbers for the hyperbolic plane and discrete analogs Parlier, Hugo ; E-print/Working paper (2017) We study colorings of the hyperbolic plane, analogously to the Hadwiger-Nelson problem for the Euclidean plane. The idea is to color points using the minimum number of colors such that no two points at ... [more ▼] We study colorings of the hyperbolic plane, analogously to the Hadwiger-Nelson problem for the Euclidean plane. The idea is to color points using the minimum number of colors such that no two points at distance exactly $d$ are of the same color. The problem depends on $d$ and, following a strategy of Kloeckner, we show linear upper bounds on the necessary number of colors. In parallel, we study the same problem on $q$-regular trees and show analogous results. For both settings, we also consider a variant which consists in replacing $d$ with an interval of distances. [less ▲] Detailed reference viewed: 3 (0 UL)The Turkish State of Emergency Under Turkish Constitutional Law and International Human Rights Law Baglayan Ceyhan, Basak E-print/Working paper (2017) Detailed reference viewed: 15 (1 UL)Asymptotic distribution of nodal intersections for arithmetic random waves Rossi, Maurizia ; E-print/Working paper (2017) Detailed reference viewed: 8 (0 UL)Freeness characterisations on free chaos spaces Bourguin, Solesne ; Nourdin, Ivan E-print/Working paper (2017) Detailed reference viewed: 3 (0 UL)Integrated likelihood based inference for nonlinear panel data models with unobserved effects Schumann, Martin ; ; Tripathi, Gautam E-print/Working paper (2017) Detailed reference viewed: 16 (0 UL)Derivative and divergence formulae for diffusion semigroups Thalmaier, Anton ; Thompson, James E-print/Working paper (2017) Detailed reference viewed: 46 (9 UL)Conformal actions of real-rank 1 simple Lie groups on pseudo-Riemannian manifolds Pecastaing, Vincent E-print/Working paper (2017) Given a simple Lie group G of rank 1, we consider compact pseudo-Riemannian manifolds (M,g) of signature (p,q) on which G can act conformally. Precisely, we determine the smallest possible value for the ... [more ▼] Given a simple Lie group G of rank 1, we consider compact pseudo-Riemannian manifolds (M,g) of signature (p,q) on which G can act conformally. Precisely, we determine the smallest possible value for the index min(p,q) of the metric. When the index is optimal and G non-exceptional, we prove that the metric must be conformally flat, confirming the idea that in a "good" dynamical context, a geometry is determined by its automorphisms group. This completes anterior investigations on pseudo-Riemannian conformal actions of semi-simple Lie groups of maximal real-rank. Combined with these results, we obtain as corollary the list of semi-simple Lie groups without compact factor that can act on compact Lorentzian manifolds. We also derive consequences in CR geometry via the Fefferman fibration. [less ▲] Detailed reference viewed: 3 (0 UL)The fourth moment theorem on the Poisson space Döbler, Christian ; Peccati, Giovanni E-print/Working paper (2017) Detailed reference viewed: 22 (2 UL)La grande région SaarLorLux, riche de ses travailleurs frontaliers Pigeron-Piroth, Isabelle ; E-print/Working paper (2016) Detailed reference viewed: 19 (2 UL)Fractional charge oscillations in quantum spin Hall quantum dots ; ; Dolcetto, Giacomo et al E-print/Working paper (2016) We show that correlated two-particle backscattering can induce fractional charge oscillations in a quantum dot built at the edge of a two-dimensional topological insulator by means of magnetic barriers ... [more ▼] We show that correlated two-particle backscattering can induce fractional charge oscillations in a quantum dot built at the edge of a two-dimensional topological insulator by means of magnetic barriers. The result nicely complements recent works where the fractional oscillations were obtained employing of semiclassical treatments. Moreover, since by rotating the magnetization of the barriers a fractional charge can be trapped in the dot via the Jackiw-Rebbi mechanism, the system we analyze offers the opportunity to study the interplay between this noninteracting charge fractionalization and the fractionalization due to two-particle backscattering. In this context, we demonstrate that the number of fractional oscillations of the charge density depends on the magnetization angle. Finally, we address the renormalization induced by two-particle backscattering on the spin density, which is characterized by a dominant oscillation, sensitive to the Jackiw-Rebbi charge, with a wavelength twice as large as the charge density oscillations. [less ▲] Detailed reference viewed: 5 (2 UL)Une minorité de citoyens reste nostalgique Paravantis, Spero E-print/Working paper (2016) Au cours de l’automne 1991, les républiques constituantes de l’Union soviétique proclamaient, l’une après l’autre, leur indépendance. Il y a 25 ans, avec la création de la Communauté des États ... [more ▼] Au cours de l’automne 1991, les républiques constituantes de l’Union soviétique proclamaient, l’une après l’autre, leur indépendance. Il y a 25 ans, avec la création de la Communauté des États indépendants (CEI), la superpuissance URSS a cessé d’exister d’un jour à l’autre. Dr. Spero S.Z. Paravantis de l’Université du Luxembourg revient sur ce grand chapitre de l’histoire. [less ▲] Detailed reference viewed: 12 (3 UL)The Gamma Stein equation and non-central de Jong theorems Döbler, Christian ; Peccati, Giovanni E-print/Working paper (2016) Detailed reference viewed: 12 (2 UL)Counting curves, and the stable length of currents ; Parlier, Hugo ; E-print/Working paper (2016) Let $\gamma_0$ be a curve on a surface $\Sigma$ of genus $g$ and with $r$ boundary components and let $\pi_1(\Sigma)\curvearrowright X$ be a discrete and cocompact action on some metric space. We study ... [more ▼] Let $\gamma_0$ be a curve on a surface $\Sigma$ of genus $g$ and with $r$ boundary components and let $\pi_1(\Sigma)\curvearrowright X$ be a discrete and cocompact action on some metric space. We study the asymptotic behavior of the number of curves $\gamma$ of type $\gamma_0$ with translation length at most $L$ on $X$. For example, as an application, we derive that for any finite generating set $S$ of $\pi_1(\Sigma)$ the limit $$\lim_{L\to\infty}\frac 1{L^{6g-6+2r}}\{\gamma\text{ of type }\gamma_0\text{ with }S\text{-translation length}\le L\}$$ exists and is positive. The main new technical tool is that the function which associates to each curve its stable length with respect to the action on $X$ extends to a (unique) continuous and homogenous function on the space of currents. We prove that this is indeed the case for any action of a torsion free hyperbolic group. [less ▲] Detailed reference viewed: 3 (0 UL)Enterprise credit, household credit and growth: New evidence from 126 countries Leon, Florian E-print/Working paper (2016) This paper attempts to distinguish the effects of household and enterprise credit on economic growth. To do so, I create a new, hand-collected database covering 143 countries over the period 1995-2014 ... [more ▼] This paper attempts to distinguish the effects of household and enterprise credit on economic growth. To do so, I create a new, hand-collected database covering 143 countries over the period 1995-2014 (126 countries are employed for econometric analysis). Estimation results confirm recent evidence documenting the absence of the effect of total credit to growth. Findings also show that household credit has a negative effect on growth, but I fail to provide robust support for a positive effect of business credit. [less ▲] Detailed reference viewed: 40 (6 UL)Arbeitszeitflexibilität in Luxemburg Sischka, Philipp ; Steffgen, Georges E-print/Working paper (2016) Männliche Arbeitnehmer weisen im Vergleich zu weiblichen Arbeitnehmern eine höhere Differenz zwischen vertraglich vereinbarter und faktischer Wochenarbeitszeit auf. Differenziert nach Berufsgruppen zeigt ... [more ▼] Männliche Arbeitnehmer weisen im Vergleich zu weiblichen Arbeitnehmern eine höhere Differenz zwischen vertraglich vereinbarter und faktischer Wochenarbeitszeit auf. Differenziert nach Berufsgruppen zeigt sich, dass inbesondere Manager sowie Führungskräfte deutlich mehr arbeiten, als vertraglich festgelegt. Atypische Arbeitszeiten (nach 19 Uhr, nach 22 Uhr oder am Wochenende) treten dagegen insbesondere bei jüngeren Arbeitnehmern (bis 44 Jahre) häufiger auf. Auch zeigen sich hier große Unterschiede über die Berufsgruppen hinweg. Für die Mehrheit der Arbeitnehmer entspricht die vertraglich vereinbarte Stundenzahl ihren Wünschen. Jedoch ist bei den jüngeren Arbeitnehmern der Anteil der Personen, die sich einen Vertrag mit mehr bezahlten Stunden wünschen deutlich höher. Differenziert nach Berufsgruppen äußern vor allem Hilfsarbeitskräfte sowie Arbeitnehmer in Dienstleistungs- und Handwerksberufen den Wunsch mehr bezahlte Stunden zu arbeiten. Die Arbeitszeitbedingungen der Arbeitnehmer weisen auch Zusammenhänge mit erlebten Work-Life-Konflikten, Zeitdruck, Stress und Arbeitszufriedenheit auf. Die Arbeitszeitbedingungen sind außerdem assoziiert mit nächtlichen Schlafstunden sowie mit der Gefährdung durch Burnout. Arbeitnehmer, die 46 Stunden und mehr arbeiten, die häufig atypische Arbeitszeiten haben, oder deren faktische Arbeitszeit stark von der vertraglich vereinbarten Arbeitszeit abweicht, erleben stärker Work-Life-Konflikte, Zeitdruck sowie Stress, geben jedoch eine geringere Arbeitszufriedenheit an, schlafen weniger und weisen eher Burnout auf. [less ▲] Detailed reference viewed: 12 (5 UL)Interrogating surface length spectra and quantifying isospectrality Parlier, Hugo E-print/Working paper (2016) This article is about inverse spectral problems for hyperbolic surfaces and in particular how length spectra relate to the geometry of the underlying surface. A quantitative answer is given to the ... [more ▼] This article is about inverse spectral problems for hyperbolic surfaces and in particular how length spectra relate to the geometry of the underlying surface. A quantitative answer is given to the following: how many questions do you need to ask a length spectrum to determine it completely? In answering this, a quantitative upper bound is given on the number of isospectral but non-isometric surfaces of a given genus. [less ▲] Detailed reference viewed: 4 (0 UL)Beziehungen – Liens Relationnels. Realitäten, Perspektiven, Grenzen – réalités, perspectives et limites. Bericht zu einer Befragung von Mitarbeiterinnen und Jugendlichen bei Solidarité Jeunes 2016 Peters, Ulla ; Jäger, Julia E-print/Working paper (2016) Solidarité Jeunes asbl in Luxemburg hat eine Befragung zum Thema Beziehungen bei den Professionellen und Jugendlichen in ihren Einrichtungen durchgeführt. Sie beauftragten die Universität damit, die ... [more ▼] Solidarité Jeunes asbl in Luxemburg hat eine Befragung zum Thema Beziehungen bei den Professionellen und Jugendlichen in ihren Einrichtungen durchgeführt. Sie beauftragten die Universität damit, die Ergebnisse aufzubereiten, zu verschriftlichen und bei einer Fachtagung zum 40-jährigen Bestehen des Trägers (bis 2012 Jongenheem asbl) im September 2016 zu präsentieren. Der Fragebogen enthielt Fragen zu den Themen: was verstehen die Jugendlichen und die Professionellen unter einer guten Beziehung, wie gestalten sie diese, welche Rituale gibt es z. B. beim Abschied von Jugendlichen und wie wird dieser vorbereitet. Eine Frage war auch, ob und welche Art von Kontakte nach dem Verlassen der Einrichtung bestehen und für wichtig gehalten werden. Die Befragung basierte auf der Annahme und der Erfahrung, dass Beziehungen ein Schlüsselfaktor und Fundament jeder erfolgreichen pädagogischen Interven- tion sind und damit auch ein zentrales „Arbeitsmittel“. [less ▲] Detailed reference viewed: 47 (3 UL)Understanding unemployment scars: A vignette Experiment of employers' decisions in Bulgaria, Greece, Norway and Switzerland ; ; et al E-print/Working paper (2016) Detailed reference viewed: 19 (3 UL)Isogeometric finite element analysis of time-harmonic exterior acoustic scattering problems ; ; Bordas, Stéphane E-print/Working paper (2016) We present an isogeometric analysis of time-harmonic exterior acoustic problems. The infinite space is truncated by a fictitious boundary and (simple) absorbing boundary conditions are applied. The ... [more ▼] We present an isogeometric analysis of time-harmonic exterior acoustic problems. The infinite space is truncated by a fictitious boundary and (simple) absorbing boundary conditions are applied. The truncation error is included in the exact solution so that the reported error is an indicator of the performance of the isogeometric analysis, in particular of the related pollution error. Numerical results performed with high-order basis functions (third or fourth orders) showed no visible pollution error even for very high frequencies. This property combined with exact geometrical representation makes isogeometric analysis a very promising platform to solve high-frequency acoustic problems. [less ▲] Detailed reference viewed: 44 (11 UL)Geometric filling curves on surfaces ; Parlier, Hugo ; E-print/Working paper (2016) This note is about a type of quantitative density of closed geodesics on closed hyperbolic surfaces. The main results are upper bounds on the length of the shortest closed geodesic that $\varepsilon ... [more ▼] This note is about a type of quantitative density of closed geodesics on closed hyperbolic surfaces. The main results are upper bounds on the length of the shortest closed geodesic that $\varepsilon$-fills the surface. [less ▲] Detailed reference viewed: 7 (0 UL)Financial Constraint, Entrepreneurship and Sectoral Migrations Leon, Florian ; E-print/Working paper (2016) Using an original database of over 3,000 micro and small enterprises (MSEs) that were microfinance institution (MFI) clients in Madagascar over the period of 2008-2014, we observe that around one third of ... [more ▼] Using an original database of over 3,000 micro and small enterprises (MSEs) that were microfinance institution (MFI) clients in Madagascar over the period of 2008-2014, we observe that around one third of these entrepreneurs switched business sectors in the first five years after starting their business. We find that the probability of an entrepreneur’s changing sectors is highly correlated with the size of the first loan obtained from the MFI. This result survives multiple robustness checks, including treatment for endogeneity and attrition. We interpret this finding in terms of financial constraint: a lack of financing prevents an entrepreneur from initially investing in his first choice sector, causing him to change sectors only when he has become financially able to do so. This result challenges the classic distinction made between ”necessity entrepreneurs” and ”opportunity entrepreneurs” and raises important questions concerning entrepreneurial talent allocation. [less ▲] Detailed reference viewed: 47 (5 UL)Intertwining operators of the quantum Teichmüller space Mazzoli, Filippo E-print/Working paper (2016) Detailed reference viewed: 17 (6 UL)Constant Gauss curvature foliations of AdS spacetimes with particles Schlenker, Jean-Marc ; E-print/Working paper (2016) We prove that for any convex globally hyperbolic maximal (GHM) anti-de Sitter (AdS) 3-dimensional space-time N with particles (cone singularities of angles less than π along time-like curves), the ... [more ▼] We prove that for any convex globally hyperbolic maximal (GHM) anti-de Sitter (AdS) 3-dimensional space-time N with particles (cone singularities of angles less than π along time-like curves), the complement of the convex core in N admits a unique foliation by constant Gauss curvature surfaces. This extends, and provides a new proof of, a result of \cite{BBZ2}. We also describe a parametrization of the space of convex GHM AdS metrics on a given manifold, with particles of given angles, by the product of two copies of the Teichm\"uller space of hyperbolic metrics with cone singularities of fixed angles. Finally, we use the results on K-surfaces to extend to hyperbolic surfaces with cone singularities of angles less than π a number of results concerning landslides, which are smoother analogs of earthquakes sharing some of their key properties. [less ▲] Detailed reference viewed: 5 (0 UL)Structural changes in the labor market and the rise of early retirement in Europe ; ; et al E-print/Working paper (2016) The rise of early retirement in Europe is typically attributed to the European system of taxes and transfers. Contrary to a purely neoclassical framework, a model with imperfectly competitive labor market ... [more ▼] The rise of early retirement in Europe is typically attributed to the European system of taxes and transfers. Contrary to a purely neoclassical framework, a model with imperfectly competitive labor market also allows to consider the effect of the bargaining power of labor and matching efficiency on pre-retirement. We find that lower bargaining power of workers and less efficient labor markets characterized by the declining matching efficiency have been an important determinant of early retirement in France and Germany. These structural changes, combined with early-retirement transfers and population ageing, are also consistent with the joint evolution of employment and unemployment rates, the labor share and the seniority premium. [less ▲] Detailed reference viewed: 14 (3 UL)Short closed geodesics with self-intersections ; Parlier, Hugo E-print/Working paper (2016) Our main point of focus is the set of closed geodesics on hyperbolic surfaces. For any fixed integer $k$, we are interested in the set of all closed geodesics with at least $k$ (but possibly more) self ... [more ▼] Our main point of focus is the set of closed geodesics on hyperbolic surfaces. For any fixed integer $k$, we are interested in the set of all closed geodesics with at least $k$ (but possibly more) self-intersections. Among these, we consider those of minimal length and investigate their self-intersection numbers. We prove that their intersection numbers are upper bounded by a universal linear function in $k$ (which holds for any hyperbolic surface). Moreover, in the presence of cusps, we get bounds which imply that the self-intersection numbers behave asymptotically like $k$ for growing $k$. [less ▲] Detailed reference viewed: 5 (0 UL)Centralizers of irreducible subgroups in the projective special linear group Guerin, Clément E-print/Working paper (2016) In this paper, we classify conjugacy classes of centralizers of irreducible subgroups in $PSL(n,\mathbb{C})$ using alternate modules a.k.a. finite abelian groups with an alternate bilinear form. When $n ... [more ▼] In this paper, we classify conjugacy classes of centralizers of irreducible subgroups in $PSL(n,\mathbb{C})$ using alternate modules a.k.a. finite abelian groups with an alternate bilinear form. When $n$ is squarefree, we prove that these conjugacy classes are classified by their isomorphism classes. More generally, we define a finite graph related to this classification whose combinatorial properties are expected to help us describe the stratification of the singular (orbifold) locus in some character varieties. [less ▲] Detailed reference viewed: 20 (1 UL)The effects of Assortative Matching on Job and Marital Satisfaction through University Attendance Joxhe, Majlinda ; E-print/Working paper (2016) This paper examines how the decision to acquire higher education may affect job and marital satisfaction. We propose a theoretical model where individuals decide whether to attend university both for ... [more ▼] This paper examines how the decision to acquire higher education may affect job and marital satisfaction. We propose a theoretical model where individuals decide whether to attend university both for obtaining higher job satisfaction and for meeting potential partners. As the probability of marrying an educated partner increases (due to positive educational assortative matching), the average ability of university students falls, since more (low ability) students are willing to attend university. Two effects can be withdrawn: (i) average job satisfaction decreases, while (ii) marital satisfaction increases. We then test the model using the British Household Panel Survey for years 1996-2008, using a dynamic bivariate model. Consistent with the theoretical predictions, we find that higher education is correlated with lower average job satisfaction. In addition, the higher education of the partner increases marital satisfaction. [less ▲] Detailed reference viewed: 13 (3 UL)Mumford curves covering p-adic Shimura curves and their fundamental domains Amoros Carafi, Laia ; E-print/Working paper (2016) We give an explicit description of fundamental domains associated to the p-adic uniformisa- tion of families of Shimura curves of discriminant Dp and level N ≥ 1, for which the one-sided ideal class ... [more ▼] We give an explicit description of fundamental domains associated to the p-adic uniformisa- tion of families of Shimura curves of discriminant Dp and level N ≥ 1, for which the one-sided ideal class number h(D,N) is 1. The obtained results generalise those in [19, Ch. IX] for Shimura curves of discriminant 2p and level N = 1. The method we present here enables us to find Mumford curves covering Shimura curves, together with a free system of generators for the associated Schottky groups, p-adic good fundamental domains and their stable reduction- graphs. This is based on a detailed study of the modular arithmetic of an Eichler order of level N inside the definite quaternion algebra of discriminant D, for which we generalise classical results of Hurwitz [20]. As an application, we prove general formulas for the reduction-graphs with lengths at p of the considered families of Shimura curves. [less ▲] Detailed reference viewed: 5 (2 UL)Distances in domino flip graphs Parlier, Hugo ; E-print/Working paper (2016) This article is about measuring and visualizing distances between domino tilings. Given two tilings of a simply connected square tiled surface, we're interested in the minimum number of flips between two ... [more ▼] This article is about measuring and visualizing distances between domino tilings. Given two tilings of a simply connected square tiled surface, we're interested in the minimum number of flips between two tilings. Given a certain shape, we're interested in computing the diameters of the flip graphs, meaning the maximal distance between any two of its tilings. Building on work of Thurston and others, we give geometric interpretations of distances which result in formulas for the diameters of the flip graphs of rectangles or Aztec diamonds. [less ▲] Detailed reference viewed: 2 (0 UL)Equilibrium and first-best city with endogenous exposure to local air pollution from traffic Schindler, Mirjam ; Caruso, Geoffrey ; Picard, Pierre M E-print/Working paper (2016) Exposure to urban traffic-induced air pollution is a major health concern of cities. This paper analyzes the urban structure when localized pollution exposure arises from commuting traffic and ... [more ▼] Exposure to urban traffic-induced air pollution is a major health concern of cities. This paper analyzes the urban structure when localized pollution exposure arises from commuting traffic and investigates the feedback effect of endogenous pollution on residential choices. The presence of stronger traffic-induced air pollution exposure reduces the geographical extent and the population of cities. Land rents fall with distance from the city center while population densities may be non-monotonic. Cleaner vehicle technologies reduce pollution exposure everywhere, increase population and density everywhere and do not affect the spatial extent of the city. The paper compares the urban equilibrium with the first-best. The first-best structure is a less expanded city with higher densities at the center and lower densities at the fringe. [less ▲] Detailed reference viewed: 37 (16 UL)Remit for what? The Impact of Information Asymmetries in Transnational Households Joxhe, Majlinda ; E-print/Working paper (2016) The main purpose of this paper is to check whether information asymmetry may affect the allocation of a given budget between in-kind consumption-type goods and in-kind investment-type choices. In order to ... [more ▼] The main purpose of this paper is to check whether information asymmetry may affect the allocation of a given budget between in-kind consumption-type goods and in-kind investment-type choices. In order to test the model, we use the results of a lab-in-the-field experiment where migrants engage in a dictator game and are asked to earmark a given budget between consumption and investment goods to be delivered to the most closely connected household (MCCH). Three different scenarios of information sharing with the MCCH on the choices made by the migrant are considered – private information, full information sharing and information sharing with a social excuse for investment goods. Empirical results confirm that under private information investment goods are preferred, whereas under full information sharing we observe a significant bias towards consumption goods (about 70 euros more out of a total budget value of 1000 euros, i.e. 7%). This behavior under different information sharing scenarios may be interpreted as evidence of self-interest motives to remit rather than pure altruism. [less ▲] Detailed reference viewed: 18 (7 UL)Phase singularities in complex arithmetic random waves ; Nourdin, Ivan ; Peccati, Giovanni et al E-print/Working paper (2016) Detailed reference viewed: 29 (3 UL)Context-based Pseudonym Changing Scheme for Vehicular Adhoc Networks Emara, Karim Ahmed Awad El-Sayed ; ; E-print/Working paper (2016) Vehicular adhoc networks allow vehicles to share their information for safety and traffic efficiency. However, sharing information may threaten the driver privacy because it includes spatiotemporal ... [more ▼] Vehicular adhoc networks allow vehicles to share their information for safety and traffic efficiency. However, sharing information may threaten the driver privacy because it includes spatiotemporal information and is broadcast publicly and periodically. In this paper, we propose a context-adaptive pseudonym changing scheme which lets a vehicle decide autonomously when to change its pseudonym and how long it should remain silent to ensure unlinkability. This scheme adapts dynamically based on the density of the surrounding traffic and the user privacy preferences. We employ a multi-target tracking algorithm to measure privacy in terms of traceability in realistic vehicle traces. We use Monte Carlo analysis to estimate the quality of service (QoS) of a forward collision warning application when vehicles apply this scheme. According to the experimental results, the proposed scheme provides a better compromise between traceability and QoS than a random silent period scheme. [less ▲] Detailed reference viewed: 7 (0 UL)Information sharing, credit booms and financial stability Leon, Florian ; E-print/Working paper (2016) This paper analyzes the impact of credit information sharing on financial stability, drawing special attention to its interactions with credit booms. A probit estimation of financial vulnerability ... [more ▼] This paper analyzes the impact of credit information sharing on financial stability, drawing special attention to its interactions with credit booms. A probit estimation of financial vulnerability episodes – identified by jumps of the ratio of non-performing loans to total loans, is run for a sample of 159 countries dividing in two sub-samples according to their level of development: 80 advanced or emerging economies and 79 less developed countries. The results show that: i) credit information sharing reduces financial fragility for both groups of countries; ii) for less developed countries, the main effect is the direct effect (reduction of NPL ratio once credit boom is controlled), suggesting a portfolio quality effect; iii) for advanced and emerging countries, credit information sharing (IS) also mitigates the detrimental impact of credit boom on financial fragility, iv) the depth of IS has an negative impact on the likelihood of credit booms (but not the coverage of IS). [less ▲] Detailed reference viewed: 77 (17 UL)Turkey declares state of emergency and derogates from ECHR after failed coup d’état Baglayan Ceyhan, Basak E-print/Working paper (2016) Detailed reference viewed: 47 (5 UL)Interactions Between Administrative and Criminal Law in the Context of the Enforcement of Bank Prudential Regulations Allegrezza, Silvia ; Rodopoulos, Ioannis E-print/Working paper (2016) Detailed reference viewed: 45 (4 UL)Burnout am Arbeitsplatz in Luxemburg Sischka, Philipp ; Steffgen, Georges E-print/Working paper (2016) Die Burnoutprävalenz der luxemburgischen Arbeitnehmer liegt für 2013 bis 2015 zwischen 15,7 und 18,0%. Während Frauen 2013 eine höhere Burnoutprävalenz im Vergleich zu Männern aufweisen, verringert sich ... [more ▼] Die Burnoutprävalenz der luxemburgischen Arbeitnehmer liegt für 2013 bis 2015 zwischen 15,7 und 18,0%. Während Frauen 2013 eine höhere Burnoutprävalenz im Vergleich zu Männern aufweisen, verringert sich diese Differenz 2014 und 2015 etwas. Die 25-34 Jährigen Arbeitnehmer scheinen seltener von Burnout betroffen zu sein. Demgegenüber weisen die 35-44 und 45-54 Jährigen über alle drei Erhebungsjahre überdurchschnittliche Burnoutprävalenzen auf. Differenziert man die Arbeitnehmer nach Voll- und Teilzeitstellen, ergeben sich nur geringfügige Unterschiede. Arbeitnehmer, die 0-5 Jahre in ihrem jetzigen Betrieb arbeiten sind im Vergleich zu Arbeitnehmern mit einer längeren Betriebszugehörigkeitsdauer unterdurchschnittlich von Burnout betroffen. Arbeitnehmer, die eine Reduktion der Belegschaft in ihrem Betrieb konstatieren, sind deutlich stärker von Burnout betroffen, als Personen, die keine Veränderung oder sogar eine Erhöhung der Belegschaft festgestellt haben. Arbeitnehmer, die von Aktionen zur Aufklärung von Gesundheitsproblemen in ihrer Organisation berichten, sind ebenfalls weniger stark von Burnout betroffen im Vergleich zu Arbeitnehmern, die berichten, dass in den letzten drei Jahren keine Aktionen zur Aufklärung von Gesundheitsproblemen stattgefunden haben. Differenziert man die Arbeitnehmer nach ISCO-Berufsklassifikation, ist die Burnoutprävalenz unter Managern bzw. Führungskräften am Geringsten, bei Arbeitnehmern die Anlagen bedienen und Montageberufen als auch bei Technikern dagegen am höchsten. Arbeitnehmer mit deutscher und luxemburgischer Nationalität sind seltener, Arbeitnehmer mit französischer und belgischer Nationalität dagegen öfter von Burnout betroffen. [less ▲] Detailed reference viewed: 39 (5 UL)Gender Gaps in Social Capital: A theoretical interpretation of the Italian evidence Joxhe, Majlinda ; E-print/Working paper (2016) In this paper, we show that social capital accumulation along the life cycle is different for men and women. We discuss the concept of social capital and some problems connected to its definition and ... [more ▼] In this paper, we show that social capital accumulation along the life cycle is different for men and women. We discuss the concept of social capital and some problems connected to its definition and measurement. We survey the literature on gender and social capital and use the Italian data of the “Multiscopo” Survey to assess differences in life cycle accumulation of social capital by sex and age. The lifecycle profile of social capital accumulation is gendered, with men accumulating more social capital at all ages, with a different peak and overall profile. We also show that, over 15 years, the gap in social capital by sex narrowed. Finally, we introduce a model of social capital structure compatible with the empirical evidence and with notions of gender as defined in feminist literature [less ▲] Detailed reference viewed: 29 (3 UL)Participation in a New Regulatory Paradigm: Collaboration and Constraint in TTIP's Regulatory Cooperation Mendes, Joana E-print/Working paper (2016) Regulatory cooperation is a core aspect of mega-regional agreements in liberalizing trade and investment, as it enables the parties to bridge their regulatory divergences beyond what is defined in the ... [more ▼] Regulatory cooperation is a core aspect of mega-regional agreements in liberalizing trade and investment, as it enables the parties to bridge their regulatory divergences beyond what is defined in the text of the agreements. It relies on institutional and procedural structures that entail both the mutual adjustment of domestic procedures of the parties and new international fora where regulators meet to negotiate and deliberate. In the case of TTIP, regulatory cooperation will be the setting in which decisions will be prepared or made on the differences between EU and US regulation that could be usefully overcome; on the technical requirements that are unnecessarily duplicated; on the standards that should remain in place because they contend with public policy objectives in a way that would not be compatible with domestic standards; on the areas that are too distinct to justify attempts at mutual recognition or other forms of regulatory compatibility; on the standards that both parties will promote globally. This paper focuses on participation, which in addition to information exchanges and regulatory impact assessments, forms part of the trio of “good regulatory practices” that constitute the procedural basis of regulatory cooperation under TTIP. [less ▲] Detailed reference viewed: 13 (3 UL)The Empire Strikes Back: Yukos-Russia, 1-1 Fahner, Johannes Hendrik E-print/Working paper (2016) Detailed reference viewed: 25 (1 UL)The Presumption of Innocence (and the Right to be Present at Trial) Directive Lamberigts, Stijn E-print/Working paper (2016) Detailed reference viewed: 28 (4 UL)Corporate Liability Debate still Alive and Kicking in US Courts Baglayan Ceyhan, Basak E-print/Working paper (2016) Detailed reference viewed: 21 (4 UL)Regards sur l'intégration linguistique Heinz, Andreas ; Fehlen, Fernand E-print/Working paper (2016) Les Luxembourgeois nés au Luxembourg se distinguent de manière significative de ceux nés à l'étranger. De même, les proportions des principales langues diffèrent parmi les étrangers, s’ils sont nés au ... [more ▼] Les Luxembourgeois nés au Luxembourg se distinguent de manière significative de ceux nés à l'étranger. De même, les proportions des principales langues diffèrent parmi les étrangers, s’ils sont nés au Luxembourg ou s’ils y sont venus au cours de leur vie. Si les deux parents sont nés au Luxembourg, la langue principale est pratiquement toujours le luxembourgeois. Cependant, si un parent est né à l'étranger, le luxembourgeois est la langue principale dans un peu plus de trois quarts des cas. Pratiquement tous les immigrés allemands ont l’allemand ou le luxembourgeois comme langue principale tandis que les Français indiquent pour des périodes d'immigration comparables moins souvent le luxembourgeois comme langue principale. Une forte proportion des immigrés portugais conserve le portugais comme langue principale. [less ▲] Detailed reference viewed: 64 (11 UL)Regards sur langues au travail Heinz, Andreas ; Fehlen, Fernand E-print/Working paper (2016) Le français se trouve en tête des langues parlées au travail par les résidents, suivi du luxembourgeois. C’est la langue la plus parlée dans tous les secteurs économiques du privé, tandis que le ... [more ▼] Le français se trouve en tête des langues parlées au travail par les résidents, suivi du luxembourgeois. C’est la langue la plus parlée dans tous les secteurs économiques du privé, tandis que le luxembourgeois a ses bastions dans le secteur public et parapublic. Le français connaît une forte présence dans pratiquement tous les grands groupes CITP (Classification Internationale Type des Professions). Le luxembourgeois est la langue la plus utilisée dans l'armée et dans l’agriculture, tandis que le portugais est surreprésenté parmi les artisans et les ouvriers non qualifiés. L’anglais est largement utilisé dans les professions qui exigent une éducation formelle élevée, alors que le portugais est surtout utilisé dans les professions nécessitant seulement une éducation formelle faible. Comme l’implantation des différentes branches économiques n’est pas homogène dans le pays, on peut constater une forte variation géographique pour l’utilisation des langues au travail. [less ▲] Detailed reference viewed: 73 (16 UL)Alternate modules are subsymplectic Guerin, Clément E-print/Working paper (2016) In this paper, an alternate module $(A,\phi)$ is a finite abelian group $A$ with a $\mathbb{Z}$-bilinear application $\phi:A\times A\rightarrow \mathbb{Q}/\mathbb{Z}$ which is alternate (i.e. zero on the ... [more ▼] In this paper, an alternate module $(A,\phi)$ is a finite abelian group $A$ with a $\mathbb{Z}$-bilinear application $\phi:A\times A\rightarrow \mathbb{Q}/\mathbb{Z}$ which is alternate (i.e. zero on the diagonal). We shall prove that any alternate module is subsymplectic, i.e. if $(A,\phi)$ has a Lagrangian of cardinal $n$ then there exists an abelian group $B$ of order $n$ such that $(A,\phi)$ is a submodule of the standard symplectic module $B\times B^*$. [less ▲] Detailed reference viewed: 10 (0 UL)The helical gap in interacting Rashba wires at low electron densities Schmidt, Thomas ; Pedder, Christopher E-print/Working paper (2016) Rashba spin-orbit coupling and a magnetic field perpendicular to the Rashba axis have been predicted to open a partial gap ("helical gap") in the energy spectrum of noninteracting or weakly interacting ... [more ▼] Rashba spin-orbit coupling and a magnetic field perpendicular to the Rashba axis have been predicted to open a partial gap ("helical gap") in the energy spectrum of noninteracting or weakly interacting one-dimensional quantum wires. By comparing kinetic energy and Coulomb energy we show that this gap opening typically occurs at low electron densities where the Coulomb energy dominates. To address this strongly correlated limit, we investigate Rashba wires using Wigner crystal theory. We find that the helical gap exists even in the limit of strong interactions but its dependence on electron density differs significantly from the weakly interacting case. In particular, we find that the critical magnetic field for opening the gap becomes an oscillatory function of electron density. [less ▲] Detailed reference viewed: 20 (4 UL)Kingdom of Spain v. Council: another piece in the "Schengen puzzle" Marletta, Angelo E-print/Working paper (2016) Detailed reference viewed: 19 (4 UL)Case C-25/15 Balogh – The Translation and Interpretation Directive and (questionable) special procedures Lamberigts, Stijn E-print/Working paper (2016) Detailed reference viewed: 32 (3 UL)Higher signature Delaunay decompositions ; ; Schlenker, Jean-Marc E-print/Working paper (2016) A Delaunay decomposition is a cell decomposition in R^d for which each cell is inscribed in a Euclidean ball which is empty of all other vertices. This article introduces a generalization of the Delaunay ... [more ▼] A Delaunay decomposition is a cell decomposition in R^d for which each cell is inscribed in a Euclidean ball which is empty of all other vertices. This article introduces a generalization of the Delaunay decomposition in which the Euclidean balls in the empty ball condition are replaced by other families of regions bounded by certain quadratic hypersurfaces. This generalized notion is adaptable to geometric contexts in which the natural space from which the point set is sampled is not Euclidean, but rather some other flat semi-Riemannian geometry, possibly with degenerate directions. We prove the existence and uniqueness of the decomposition and discuss some of its basic properties. In the case of dimension d = 2, we study the extent to which some of the well-known optimality properties of the Euclidean Delaunay triangulation generalize to the higher signature setting. In particular, we describe a higher signature generalization of a well-known description of Delaunay decompositions in terms of the intersection angles between the circumscribed circles. [less ▲] Detailed reference viewed: 13 (2 UL)Once punctured disks, non-convex polygons, and pointihedra Parlier, Hugo ; E-print/Working paper (2016) We explore several families of flip-graphs, all related to polygons or punctured polygons. In particular, we consider the topological flip-graphs of once-punctured polygons which, in turn, contain all ... [more ▼] We explore several families of flip-graphs, all related to polygons or punctured polygons. In particular, we consider the topological flip-graphs of once-punctured polygons which, in turn, contain all possible geometric flip-graphs of polygons with a marked point as embedded sub-graphs. Our main focus is on the geometric properties of these graphs and how they relate to one another. In particular, we show that the embeddings between them are strongly convex (or, said otherwise, totally geodesic). We also find bounds on the diameters of these graphs, sometimes using the strongly convex embeddings. Finally, we show how these graphs relate to different polytopes, namely type D associahedra and a family of secondary polytopes which we call pointihedra. [less ▲] Detailed reference viewed: 3 (0 UL)Bad irreducible subgroups and singular locus for character varieties in PSL(p,C) Guerin, Clément E-print/Working paper (2016) We give the centralizers of irreducible representations from a finitely generated group $\Gamma$ to $PSL(p,\mathbb{C})$ where p is a prime number. This leads to a description of the singular locus (te ... [more ▼] We give the centralizers of irreducible representations from a finitely generated group $\Gamma$ to $PSL(p,\mathbb{C})$ where p is a prime number. This leads to a description of the singular locus (te (the set of conjugacy classes of representations whose centralizer strictly contains the center of the ambient group) of the irreducible part of the character variety $\chi^i(\Gamma,PSL(p,\mathbb{C}))$. When $\Gamma$ is a free group of rank $l\geq 2$ or the fundamental group of a closed Riemann surface of genus $g\geq 2$, we give a complete description of this locus and prove that this locus is exactly the set of algebraic singularities of the irreducible part of the character variety. [less ▲] Detailed reference viewed: 10 (1 UL)The Effect of Survey Design on Extreme Response Style: Rating Job Satisfaction Joxhe, Majlinda ; E-print/Working paper (2016) This paper explores the relationship between survey rating scale and Extreme Response Style (ERS) using experimental data from Understanding Society (Innovation Panel 2008), where a self-assessment ... [more ▼] This paper explores the relationship between survey rating scale and Extreme Response Style (ERS) using experimental data from Understanding Society (Innovation Panel 2008), where a self-assessment questionnaire measuring job satisfaction uses two alternative (7 and 11 points) rating options. Our results suggests that when shifting from a shorter to a longer scale, the survey design generates a tendency to choose response scales at the extreme of the distribution, thus creating a misleading quantification of the variable of interest. The experimental design of the data enables us to test our hypothesis using a non-linear estimation approach where age, gender and education level are shown to affect ERS. [less ▲] Detailed reference viewed: 51 (9 UL)Islamic Banking Development and access to credit Leon, Florian ; E-print/Working paper (2016) The recent expansion of Islamic banks raises questions on its economic implications. The aim of this paper is to investigate the impact of Islamic banking development on access to credit. We combine data ... [more ▼] The recent expansion of Islamic banks raises questions on its economic implications. The aim of this paper is to investigate the impact of Islamic banking development on access to credit. We combine data from a unique hand-collected database that covers Islamic banks over the period of 2000 to 2005 with firm-level data covering developing and emerging countries. We find that Islamic banking development has overall no impact on credit constraints, while banking development and conventional banking development alleviate obstacles to financing. However Islamic banking development exerts a positive impact on access to credit when conventional banking development is low. Hence we support the view that Islamic banking does not overall alleviate obstacles to financing, but it can act as substitute to conventional banking. [less ▲] Detailed reference viewed: 253 (9 UL)Weak Poincaré Inequality for Convolution Probability Measures Cheng, Li Juan ; E-print/Working paper (2016) In this article, weak Poincaré inequalities are established for convolution measures by using Lyapunov conditions. As applications, these results are further applied to some explicit cases. Detailed reference viewed: 26 (10 UL)Attractors in spacetimes and time functions Monclair, Daniel E-print/Working paper (2016) Detailed reference viewed: 4 (0 UL)How to discretize the differential forms on the interval ; Schätz, Florian E-print/Working paper (2016) We provide explicit quasi-isomorphisms between the following three algebraic structures associated to the unit interval: i) the commutative dg algebra of differential forms, ii) the non-commutative dg ... [more ▼] We provide explicit quasi-isomorphisms between the following three algebraic structures associated to the unit interval: i) the commutative dg algebra of differential forms, ii) the non-commutative dg algebra of simplicial cochains and iii) the Whitney forms, equipped with a homotopy commutative and homotopy associative, i.e. C-∞, algebra structure. Our main interest lies in a natural `discretization' C-∞ quasi-isomorphism φ from differential forms to Whitney forms. We establish a uniqueness result that implies that φ coincides with the morphism from homotopy transfer, and obtain several explicit formulas for φ, all of which are related to the Magnus expansion. In particular, we recover combinatorial formulas for the Magnus expansion due to Mielnik and Plebanski. [less ▲] Detailed reference viewed: 11 (0 UL)Critical exponent and Hausdorff dimension for quasi-Fuchsian AdS manifolds Glorieux, Olivier ; Monclair, Daniel E-print/Working paper (2016) Detailed reference viewed: 3 (0 UL)An explicit two step quantization of Poisson structures and Lie bialgebras Merkulov, Sergei ; E-print/Working paper (2016) We develop a new approach to deformation quantizations of Lie bialgebras and Poisson structures which goes in two steps. In the first step one associates to any Poisson (resp. Lie bialgebra) structure a ... [more ▼] We develop a new approach to deformation quantizations of Lie bialgebras and Poisson structures which goes in two steps. In the first step one associates to any Poisson (resp. Lie bialgebra) structure a so called quantizable Poisson (resp. Lie bialgebra) structure. We show explicit transcendental formulae for this correspondence. In the second step one deformation quantizes a quantizable Poisson (resp. Lie bialgebra) structure. We show again explicit transcendental formulae for this second step correspondence (as a byproduct we obtain configuration space models for biassociahedron and bipermutohedron). In the Poisson case the first step is the most non-trivial one and requires a choice of an associator while the second step quantization is essentially unique, it is independent of a choice of an associator and can be done by a trivial induction. We conjecture that similar statements hold true in the case of Lie bialgebras. The main new result is a surprisingly simple explicit universal formula (which uses only smooth differential forms) for universal quantizations of finite-dimensional Lie bialgebras. [less ▲] Detailed reference viewed: 15 (0 UL)Malaise in the Western Middle Classes Chauvel, Louis ; Hartung, Anne E-print/Working paper (2016) Detailed reference viewed: 28 (5 UL)Stochastic completeness and gradient representations for sub-Riemannian manifolds ; Thalmaier, Anton E-print/Working paper (2016) Detailed reference viewed: 18 (2 UL)Spectral gap on Riemannian path space over static and evolving manifolds Cheng, Li Juan ; Thalmaier, Anton E-print/Working paper (2016) Detailed reference viewed: 21 (4 UL)Characterization of pinched Ricci curvature by functional inequalities Cheng, Li Juan ; Thalmaier, Anton E-print/Working paper (2016) Detailed reference viewed: 38 (9 UL)Classification of universal formality maps for quantizations of Lie bialgebras Merkulov, Sergei ; E-print/Working paper (2016) We introduce an endofunctor D in the category of augmented props with the property that for any representation of a prop P in a vector space V the associated prop DP admits an induced representation on ... [more ▼] We introduce an endofunctor D in the category of augmented props with the property that for any representation of a prop P in a vector space V the associated prop DP admits an induced representation on the graded commutative tensor algebra S(V) given in terms of polydifferential operators. Applying this functor to the prop LieB of Lie bialgebras we show that universal formality maps for quantizations of Lie bialgebras are in in 1-1 correspondence with prop morphisms from the minimal resolution AssB_infty of the prop of associative bialgebras to the polydifferential prop DLieB_infty satisfying certain boundary conditions. We prove that the set of such formality morphisms (having an extra property of being Lie connected) is non-empty. The latter result is used in turn to give a short proof of the formality theorem for universal quantizations of arbitrary Lie bialgebras which says that for any Drinfeld associator there is an associated Lie_infty quasi-isomorphism between the Lie_infty algebras controlling, respectively, deformations of the standard bialgebra structure in S(V) and deformations of any given Lie bialgebra structure in V. We study the deformation complex of an arbitrary universal formality morphism and show that it is quasi-isomorphic (up to one class corresponding to the standard rescaling automorphism of the properad LieB) to the oriented graph complex GC or 3 studied earlier in \cite{Wi2}. This result gives a complete classification of the set of gauge equivalence classes of universal Lie connected formality maps --- it is a torsor over the Grothendieck-Teichm\"uller group GRT and can hence can be identified with the set of Drinfeld associators. [less ▲] Detailed reference viewed: 18 (0 UL)Lorentzian manifolds with a conformal action of SL(2,R) Pecastaing, Vincent E-print/Working paper (2016) We consider conformal actions of simple Lie groups on compact Lorentzian manifolds. Mainly motivated by the Lorentzian version of a conjecture of Lichnerowicz, we establish the alternative: Either the ... [more ▼] We consider conformal actions of simple Lie groups on compact Lorentzian manifolds. Mainly motivated by the Lorentzian version of a conjecture of Lichnerowicz, we establish the alternative: Either the group acts isometrically for some metric in the conformal class, or the manifold is conformally flat - that is, everywhere locally conformally diffeomorphic to Minkowski space-time. When the group is non-compact and not locally isomorphic to SO(1,n), n>1, we derive global conclusions, extending a theorem of Frances and Zeghib to some simple Lie groups of real-rank 1. This result is also a first step towards a classification of the conformal groups of compact Lorentz manifolds, analogous to a classification of their isometry groups due to Adams, Stuck and, independently, Zeghib at the end of the 1990's. [less ▲] Detailed reference viewed: 5 (1 UL)Prescribing metrics on the boundary of AdS 3-manifolds Tamburelli, Andrea E-print/Working paper (2016) We prove that given two metrics g+ and g− with curvature κ<−1 on a closed, oriented surface S of genus τ≥2, there exists an AdS manifold N with smooth, space-like, strictly convex boundary such that the ... [more ▼] We prove that given two metrics g+ and g− with curvature κ<−1 on a closed, oriented surface S of genus τ≥2, there exists an AdS manifold N with smooth, space-like, strictly convex boundary such that the induced metrics on the two connected components of ∂N are equal to g+ and g−. Using the duality between convex space-like surfaces in AdS3, we obtain an equivalent result about the prescription of the third fundamental form. [less ▲] Detailed reference viewed: 46 (7 UL)An observation of circular RNAs in bacterial RNA-seq data ; ; Fouquier d'Hérouël, Aymeric et al E-print/Working paper (2016) Circular RNAs (circRNAs) are a class of RNA with an important role in micro RNA (miRNA) regulation recently discovered in Human and various other eukaryotes as well as in archaea. Here, we have analyzed ... [more ▼] Circular RNAs (circRNAs) are a class of RNA with an important role in micro RNA (miRNA) regulation recently discovered in Human and various other eukaryotes as well as in archaea. Here, we have analyzed RNA-seq data obtained from Enterococcus faecalis and Escherichia coli in a way similar to previous studies performed on eukaryotes. We report observations of circRNAs in RNA-seq data that are reproducible across multiple experiments performed with different protocols or growth conditions. [less ▲] Detailed reference viewed: 26 (9 UL)The EU-Turkey Statement: A Treaty That Violates Democracy Gatti, Mauro E-print/Working paper (2016) Detailed reference viewed: 16 (0 UL)Poisson cohomology of holomorphic toric Poisson manifolds Hong, Wei E-print/Working paper (2016) Detailed reference viewed: 6 (0 UL)The Rise of National Supervisory Policy-Making Accountability to the EU Level: The Supervision of Less Significant Banks in the Single Supervisory Mechanism Gren, Jakub E-print/Working paper (2016) Detailed reference viewed: 13 (0 UL)The Defect of Random Hyperspherical Harmonics Rossi, Maurizia E-print/Working paper (2016) Detailed reference viewed: 31 (2 UL)Weak symmetric integrals with respect to the fractional Brownian motion ; Nourdin, Ivan ; E-print/Working paper (2016) Detailed reference viewed: 3 (0 UL)Brownian bridges to submanifolds Thompson, James E-print/Working paper (2016) We introduce and study Brownian bridges to submanifolds. Our method involves proving a general formula for the integral over a submanifold of the minimal heat kernel on a complete Riemannian manifold. We ... [more ▼] We introduce and study Brownian bridges to submanifolds. Our method involves proving a general formula for the integral over a submanifold of the minimal heat kernel on a complete Riemannian manifold. We use the formula to derive lower bounds, an asymptotic relation and derivative estimates. We also see a connection to hypersurface local time. This work is motivated by the desire to extend the analysis of path and loop spaces to measures on paths which terminate on a submanifold. [less ▲] Detailed reference viewed: 57 (16 UL)Die Karte des luxemburgisch-kurtrierischen Grenzverlaufs aus dem Jahr 1776 – Ein Meisterwerk der Kartographie des späten Ancien Régime und eine faszinierende Quelle für die Landesgeschichte Uhrmacher, Martin E-print/Working paper (2016) Das Nationalarchiv hat drei außergewöhnliche Dokumente aus dem Jahr 1776 online gestellt. Hierbei handelt es sich um zwei sehr große Karten (7,1m x 2m ; 3,3m x 2,1m), die den Grenzverlauf zwischen ... [more ▼] Das Nationalarchiv hat drei außergewöhnliche Dokumente aus dem Jahr 1776 online gestellt. Hierbei handelt es sich um zwei sehr große Karten (7,1m x 2m ; 3,3m x 2,1m), die den Grenzverlauf zwischen Luxemburg und dem Kurfürstentum Trier zeigen. Sie wurden vom Ingenieur Bergé, Oberleutnant der österreichischen Armee, gezeichnet und mit Hilfe des Fotografen Tom Lucas und des Musée Dräi Eechelen digitalisiert. Hinzu kommt ein historisches Dokument von 325 Seiten in dem die auf den Karten abgebildete Grenze in Frage gestellt wird. Beide Karten sind aufgrund ihrer Größe nur schwer einsehbar, stellen aber eine wichtige Quelle für die Geschichte Luxemburgs dar und sind reich an Informationen, Details und Farben. Martin Uhrmacher, Dozent und Forscher an der Universität Luxemburg und Experte auf dem Gebiet der historischen Kartographie, hat beide Karten in diesem Beitrag ausführlich analysiert. [less ▲] Detailed reference viewed: 16 (1 UL)Model spaces in sub-Riemannian geometry Grong, Erlend E-print/Working paper (2016) We consider sub-Riemannian spaces admitting an isometry group that is maximal in the sense that any linear isometry of the horizontal tangent spaces is realized by a global isometry. We will show that ... [more ▼] We consider sub-Riemannian spaces admitting an isometry group that is maximal in the sense that any linear isometry of the horizontal tangent spaces is realized by a global isometry. We will show that these spaces have a canonical partial connection defined on their horizontal bundle. However, unlike the Riemannian case, such spaces are not uniquely determined by their curvature and their metric tangent cone. Furthermore, the number of invariants needed to determine model spaces with the same tangent cone is in general greater than one. [less ▲] Detailed reference viewed: 16 (1 UL)Conceptual Confusion: the case of Epigenetics ; Fouquier d'Hérouël, Aymeric ; E-print/Working paper (2016) The observations of phenotypic plasticity have stimulated the revival of "epigenetics". Over the past 70 years the term has come in many colors and flavors, depending on the biological discipline and time ... [more ▼] The observations of phenotypic plasticity have stimulated the revival of "epigenetics". Over the past 70 years the term has come in many colors and flavors, depending on the biological discipline and time period. The meanings span from Waddington "epigenotype" and "epigenetic landscape" to the molecular biologists "epigenetic marks" embodied by DNA methylation and histone modifications. Here we seek to quell the ambiguity of the name. First we place "epigenetic" in the various historical contexts. Then, by presenting the formal concepts of dynamical systems theory we show that the "epigenetic landscape" is more than a metaphor: it has specific mathematical foundations. The latter explains how gene regulatory networks produce multiple attractor states, the self-stabilizing patterns of gene activation across the genome that account for "epigenetic memory". This network dynamics approach replaces the reductionist correspondence of molecular epigenetic modifications with concept of the epigenetic landscape, by providing a concrete and crisp correspondence. [less ▲] Detailed reference viewed: 58 (4 UL)Constant mean curvature foliation of domain of dependence in AdS3 Tamburelli, Andrea E-print/Working paper (2016) We prove that, given an acausal curve in the boundary at infinity of Anti-de Sitter space which is the graph of a quasi-symmetric homeomorphism, there exists a foliation of its domain of dependence by ... [more ▼] We prove that, given an acausal curve in the boundary at infinity of Anti-de Sitter space which is the graph of a quasi-symmetric homeomorphism, there exists a foliation of its domain of dependence by constant mean curvature surfaces with bounded second fundamental form. Moreover, these surfaces provide a family of quasi-conformal extensions of the quasi-symmetric homeomorphism we started with. [less ▲] Detailed reference viewed: 32 (4 UL)Derivatives of Feynman-Kac Semigroups Thompson, James E-print/Working paper (2016) We prove Bismut-type formulae for the first and second derivatives of a Feynman-Kac semigroup on a complete Riemannian manifold. We derive local estimates and give bounds on the logarithmic derivatives of ... [more ▼] We prove Bismut-type formulae for the first and second derivatives of a Feynman-Kac semigroup on a complete Riemannian manifold. We derive local estimates and give bounds on the logarithmic derivatives of the integral kernel. Stationary solutions are also considered. The arguments are based on local martingales, although the assumptions are purely geometric. [less ▲] Detailed reference viewed: 10 (0 UL)Untraceable VoIP Communication based on DC-nets Franck, Christian ; Sorger, Ulrich E-print/Working paper (2016) Untraceable communication is about hiding the identity of the sender or the recipient of a message. Currently most systems used in practice (e.g., TOR) rely on the principle that a message is routed via ... [more ▼] Untraceable communication is about hiding the identity of the sender or the recipient of a message. Currently most systems used in practice (e.g., TOR) rely on the principle that a message is routed via several relays to obfuscate its path through the network. However, as this increases the end-to-end latency it is not ideal for applications like Voice-over-IP (VoIP) communication, where participants will notice annoying delays if the data does not arrive fast enough. We propose an approach based on the paradigm of Dining Cryptographer networks (DC-nets) that can be used to realize untraceable communication within small groups. The main features of our approach are low latency and resilience to packet-loss and fault packets sent by malicious players. We consider the special case of VoIP communication and propose techniques for a P2P implementation. We expose existing problems and sketch possible future large-scale systems composed of multiple groups. [less ▲] Detailed reference viewed: 14 (4 UL)Political Economics of Fiscal Consolidations and External Sovereign Accidents ; Koulovatianos, Christos ; E-print/Working paper (2016) As the recent chain of EU sovereign crises has demonstrated, after an unexpected massive rise to the debt GDP ratio, several EU countries manage to proceed with fiscal consolidation quickly and ... [more ▼] As the recent chain of EU sovereign crises has demonstrated, after an unexpected massive rise to the debt GDP ratio, several EU countries manage to proceed with fiscal consolidation quickly and effectively, while other countries, notably Greece, proceed slowly, fueling Graccident and Grexit scenarios, even after generous rescue packages, involving debt haircuts and monitoring from official bodies. Here we recursively formulate a game among rent-seeking groups and propose that high debt-GDP ratios lead to predictable miscoordination among rent-seeking groups, unsustainable debt dynamics, and open the path to political accidents that foretell Graccident scenarios. Our analysis and application helps in under- standing the politico-economic sustainability of sovereign rescues, emphasizing the need for fiscal targets and possible debt haircuts. We provide a calibrated example that quantifies the threshold debt-GDP ratio at 137%, remarkably close to the target set for private sector involvement in the case of Greece. [less ▲] Detailed reference viewed: 43 (6 UL)Borderscape as an Interdisciplinary Concept - Compte rendu du colloque Jeusette, Julien E-print/Working paper (2016) Detailed reference viewed: 27 (2 UL)Possible connection between a generalized Maeda's conjecture and local types ; Tsaknias, Panagiotis E-print/Working paper (2016) Detailed reference viewed: 22 (1 UL)Topics on modular Galois representations modulo prime powers ; Wiese, Gabor E-print/Working paper (2016) This article surveys modularity, level raising and level lowering questions for two-dimensional representations modulo prime powers of the absolute Galois group of the rational numbers. It contributes ... [more ▼] This article surveys modularity, level raising and level lowering questions for two-dimensional representations modulo prime powers of the absolute Galois group of the rational numbers. It contributes some new results and describes algorithms and a database of modular forms orbits and higher congruences. [less ▲] Detailed reference viewed: 8 (0 UL)Auswertung der Selbstevaluation des IDENT2-Projekts (2011-2014) Reckinger, Rachel E-print/Working paper (2015) Detailed reference viewed: 12 (1 UL)Arbeitszufriedenheit der Arbeitnehmer in Luxemburg Sischka, Philipp ; Steffgen, Georges E-print/Working paper (2015) Die Arbeitszufriedenheit der Arbeitnehmer in Luxemburg hat sich von 2013 zu 2014 insgesamt verringert. Von diesem Rückgang waren insbesondere Arbeitnehmer in der Altersklasse der 45-54 Jährigen ... [more ▼] Die Arbeitszufriedenheit der Arbeitnehmer in Luxemburg hat sich von 2013 zu 2014 insgesamt verringert. Von diesem Rückgang waren insbesondere Arbeitnehmer in der Altersklasse der 45-54 Jährigen, Arbeitnehmer mit portugiesischer Nationalität sowie in Belgien wohnhafte Arbeitnehmer betroffen. Die Veränderungen von 2014 zu 2015 fallen insgesamt moderater aus. Innerhalb dieses Zeitraums nimmt die Arbeitszufriedenheit der 16-24 Jährigen jedoch relativ stark ab. Arbeitnehmer mit portugiesischer Nationalität steigen in ihrer Arbeitszufriedenheit dagegen wieder an. Zu keinem der drei Erhebungszeitpunkte sind hinsichtlich der Arbeitszufriedenheit Unterschiede zwischen Männern und Frauen sowie zwischen Arbeitnehmern in Vollzeit und in Teilzeit festzustellen. Insgesamt berichten Manager und Führungskräfte sowie Arbeitnehmer in akademischen Berufen im Jahr 2015 über die höchste Arbeitszufriedenheit, dagegen Arbeitnehmer, die Anlagen und Maschinen bedienen sowie Arbeitnehmer, die in Land- und Forstwirtschaft beschäftigt sind, über die geringste Arbeitszufriedenheit. [less ▲] Detailed reference viewed: 88 (16 UL)Let's Talk Business: The Economic Impact of Brexit Herzog, Mechthild E-print/Working paper (2015) Detailed reference viewed: 268 (2 UL)Victimization and Safety in Luxembourg - Findings of the "Enquête sur la sécurité 2013" Heinz, Andreas ; Steffgen, Georges ; Willems, Helmut E-print/Working paper (2015) Cette publication présente les principaux résultats de « l'Enquête sur la sécurité 2013 » réalisée au Luxembourg par le STATEC et l'Université du Luxembourg/INSIDE. Les principaux objectifs de l’enquête ... [more ▼] Cette publication présente les principaux résultats de « l'Enquête sur la sécurité 2013 » réalisée au Luxembourg par le STATEC et l'Université du Luxembourg/INSIDE. Les principaux objectifs de l’enquête étaient de mesurer les taux de prévalence des délits de droit commun et de sonder les comportements relatifs à la délinquance et la sécurité. [less ▲] Detailed reference viewed: 63 (14 UL)Financing Patterns of European SMEs: An Empirical Taxonomy ; ; Heinz, Andreas E-print/Working paper (2015) This EIF Working Paper takes a holistic approach to investigate SME financing patterns in Europe by performing a cluster analysis including 12,726 SMEs in 28 European countries. The results reveal that ... [more ▼] This EIF Working Paper takes a holistic approach to investigate SME financing patterns in Europe by performing a cluster analysis including 12,726 SMEs in 28 European countries. The results reveal that SME financing in Europe is not homogenous but that different financing patterns exist. The cluster analysis identifies six distinct SME financing types: mixed-financed SMEs, state-subsidised SMEs, debt-financed SMEs, flexible-debt-financed SMEs, trade-financed SMEs and internally-financed SMEs. These SME financingtypes differ according to the number of financing instruments used and the combinations thereof. Furthermore, the SME financing types can be profiled according to their firm-, product-, industry- and country- specific characteristics. Our findings can support policy makers in assessing the impact of policy changes on SME financing and in designing financing programs tailored to the specific needs of SMEs. [less ▲] Detailed reference viewed: 26 (0 UL)Props of ribbon graphs, involutive Lie bialgebras and moduli spaces of curves M_g,n Merkulov, Sergei ; E-print/Working paper (2015) We establish a new and surprisingly strong link between two previously unrelated theories: the theory of moduli spaces of curves $\cM_{g,n}$ (which, according to Penner, is controlled by the ribbon graph ... [more ▼] We establish a new and surprisingly strong link between two previously unrelated theories: the theory of moduli spaces of curves $\cM_{g,n}$ (which, according to Penner, is controlled by the ribbon graph complex) and the homotopy theory of $E_d$ operads (controlled by ordinary graph complexes with no ribbon structure, introduced first by Kontsevich). The link between the two goes through a new intermediate {\em stable}\, ribbon graph complex which has roots in the deformation theory of quantum $A_\infty$ algebras and the theory of Kontsevich compactifications of moduli spaces of curves $\overline{\cM}_{g,n}^K$. Using a new prop of ribbon graphs and the fact that it contains the prop of involutive Lie bialgebras as a subprop we find new algebraic structures on the classical ribbon graph complex computing $H^\bu(\cM_{g,n})$. We use them to prove Comparison Theorems, and in particular to construct a non-trivial map from the ordinary to the ribbon graph cohomology. On the technical side, we construct a functor $\f$ from the category of prop(erad)s to the category of operads. If a properad $\cP$ is in addition equipped with a map from the properad governing Lie bialgebras (or graded versions thereof), then we define a notion of $\cP$-``graph'' complex, of stable $\cP$-graph complex and a certain operad, that is in good cases an $E_d$ operad. In the ribbon case, this latter operad acts on the deformation complexes of any quantum $A_\infty$-algebra. We also prove that there is a highly non-trivial, in general, action of the Grothendieck-Teichm\"uller group $GRT_1$ on the space of so-called {\em non-commutative Poisson structures}\, on any vector space $W$ equipped with a degree $-1$ symplectic form (which interpolate between cyclic $A_\infty$ structures in $W$ and ordinary polynomial Poisson structures on $W$ as an affine space). [less ▲] Detailed reference viewed: 32 (3 UL)Desperately Seeking Small Worlds in Corporate Boards: International Evidence from Listed Firms ; ; Jonard, Nicolas et al E-print/Working paper (2015) Detailed reference viewed: 46 (9 UL)Inflation Aversion in the European Union: Exploring the Myth of a North-South Divide Howarth, David ; E-print/Working paper (2015) Our study seeks to prove that German Stability Culture is a myth. The concept is a core legitimizing element of economic policy discourse in Germany and used regularly to juxtapose Germany and northern ... [more ▼] Our study seeks to prove that German Stability Culture is a myth. The concept is a core legitimizing element of economic policy discourse in Germany and used regularly to juxtapose Germany and northern Europe and the euro area periphery. Using Eurobarometer surveys we construct a measurement for Stability Culture which is based on the priority assigned to the fight against inflation. Our empirical analysis covers the 2002 to 2010 timespan and includes 27 European Union Member States. Our results show that the distinction between northern states with an allegedly strong and southern states with an allegedly weak Stability Culture is a myth. Controlling for actual inflation, we find that the northern Member States with an allegedly high Stability Culture are less concerned with price stability than the rest of the EU. [less ▲] Detailed reference viewed: 36 (1 UL)Assessing and Improving the Mutation Testing Practice of PIT ; ; Papadakis, Mike et al E-print/Working paper (2015) Detailed reference viewed: 27 (1 UL)Centrality of regions in R&D networks: Conceptual clarifications and a new measure Berge, Laurent ; ; E-print/Working paper (2015) This paper aims at introducing a novel measure of regional centrality in the context of R&D networks. We first demonstrate some substantial problems of SNA-based centrality measures to cope with regional ... [more ▼] This paper aims at introducing a novel measure of regional centrality in the context of R&D networks. We first demonstrate some substantial problems of SNA-based centrality measures to cope with regional R&D networks in a meaningful way. Then, we introduce a new measurement approach of regional network centrality based on the concept of inter-regional bridging paths (indirect connections at the regional level). We show that the formal definition of our regional bridging centrality measure can be expressed in terms of three simple components: the participation intensity of a region in inter-regional R&D collaborations, the relative outward orientation in terms of all established links and the diversification of R&D collaborations among partner regions. We illustrate the measure and its behaviour with respect to other conventional centrality measures by using the European co-patent network at the NUTS 2 level. [less ▲] Detailed reference viewed: 7 (0 UL) |
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