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See detailDeniable encryption, authentication, and key exchange
Ostrev, Dimiter UL

E-print/Working paper (2020)

We present some foundational ideas related to deniable encryption, message authentication, and key exchange in classical cryptography. We give detailed proofs of results that were previously only sketched ... [more ▼]

We present some foundational ideas related to deniable encryption, message authentication, and key exchange in classical cryptography. We give detailed proofs of results that were previously only sketched in the literature. In some cases, we reach the same conclusions as in previous papers; in other cases, the focus on rigorous proofs leads us to different formulations of the results. [less ▲]

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See detailBitcoin Governance as a Decentralized Financial Market Infrastructure
Nabilou, Hossein UL

E-print/Working paper (2020)

Bitcoin is the oldest and most widely established cryptocurrency network with the highest market capitalization among all cryptocurrencies. Although bitcoin (with lowercase b) is increasingly viewed as a ... [more ▼]

Bitcoin is the oldest and most widely established cryptocurrency network with the highest market capitalization among all cryptocurrencies. Although bitcoin (with lowercase b) is increasingly viewed as a digital asset belonging to a new asset class, the Bitcoin network (with uppercase B) is a decentralized financial market infrastructure (dFMI) that clears and settles transactions in its native asset without relying on the conventional financial market infrastructures (FMIs). To be a reliable asset class as well as a dFMI, however, Bitcoin needs to have robust governance arrangements; whether such arrangements are built into the protocol (i.e., on-chain governance mechanisms) or relegated to the participants in the Bitcoin network (i.e., off-chain governance mechanisms), or are composed of a combination of both mechanisms (i.e., a hybrid form of governance). This paper studies Bitcoin governance with a focus on its alleged shortcomings. In so doing, after defining Bitcoin governance and its objectives, the paper puts forward an idiosyncratic governance model whose main objective is to preserve and maximize the main value proposition of Bitcoin, i.e., its censorship-resistant property, which allows participants to transact in an environment with minimum social trust. Therefore, Bitcoin governance, including the processes through which Bitcoin governance crises have been resolved and the standards against which the Bitcoin Improvement Proposals (BIPs) are examined, should be analyzed in light of the prevailing narrative of Bitcoin as a censorship-resistant store of value and payment infrastructure. Within such a special governance model, this paper seeks to identify the potential shortcomings in Bitcoin governance by reference to the major governance crises that posed serious threats to Bitcoin in the last decade. It concludes that the existing governance arrangements in the Bitcoin network have been largely successful in dealing with Bitcoin’s major crises that would have otherwise become existential threats to the Bitcoin network. [less ▲]

Detailed reference viewed: 149 (2 UL)
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See detailCustomary Land Conversion and the Formation of the African City
Picard, Pierre M UL; Selod, Harris

E-print/Working paper (2020)

As cities grow and spatially expand, agricultural land is converted into residential land. In many developing countries, especially in Sub-Saharan Africa, this process is accompanied by a change in land ... [more ▼]

As cities grow and spatially expand, agricultural land is converted into residential land. In many developing countries, especially in Sub-Saharan Africa, this process is accompanied by a change in land tenure, whereby plots held under traditional customary arrangements are sold to new urban residents, possibly with formal property rights. This paper studies joint land-use and land-tenure conversion in an urban economics model in which intermediaries purchase agricultural land from customary owners and attempt to transform it into residential plots with statutory property rights. The spatial equilibrium includes a mix of land uses and rights where statutory and non-statutory residential plots coexist with customary land that is mainly used for agriculture. Because customary ownership is subject to uncertainty (because of tenure insecurity), the conversion process includes a potential information asymmetry between customary owners and intermediaries. The analysis shows that a market failure may emerge whereby some customary owners prefer to continue farming their land rather than participate in the urban residential land market, which results in a city that is too small. Empirical analysis using Malian data validates the key features of the model captured by land price gradients, as well as the ranking and the variance of land prices, and is suggestive of the presence of information asymmetry. [less ▲]

Detailed reference viewed: 106 (2 UL)
See detailBeing a World Young Leader in Dementia: Between academic brilliance and acts of kindness. Blog post
Leist, Anja UL

E-print/Working paper (2020)

The blog post describes my journey from being selected as an 'Emerging Leader in Dementia' in 2014/15 by the UK Science and Innovation Network to helping to form, with other emerging leaders, a truly ... [more ▼]

The blog post describes my journey from being selected as an 'Emerging Leader in Dementia' in 2014/15 by the UK Science and Innovation Network to helping to form, with other emerging leaders, a truly global network of World Young Leaders in Dementia, now spanning 400+ members in 29+ countries, and aiming to facilitate careers of young professionals in the field of dementia. [less ▲]

Detailed reference viewed: 46 (4 UL)
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Peer Reviewed
See detailMeasuring Pants
Doan, Nhat Minh UL; Parlier, Hugo UL; Tan, Ser Peow

E-print/Working paper (2020)

We investigate the terms arising in an identity for hyperbolic surfaces proved by Luo and Tan, namely showing that they vary monotonically in terms of lengths and that they verify certain convexity ... [more ▼]

We investigate the terms arising in an identity for hyperbolic surfaces proved by Luo and Tan, namely showing that they vary monotonically in terms of lengths and that they verify certain convexity properties. Using these properties, we deduce two results. As a first application, we show how to deduce a theorem of Thurston which states, in particular for closed hyperbolic surfaces, that if a simple length spectrum "dominates" another, then in fact the two surfaces are isometric. As a second application, we show how to find upper bounds on the number of pairs of pants of bounded length that only depend on the boundary length and the topology of the surface. [less ▲]

Detailed reference viewed: 209 (76 UL)
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See detailOn immersions of surfaces into SL(2,C) and geometric consequences
Bonsante, Francesco; El Emam, Christian UL

E-print/Working paper (2020)

We approach the study of totally real immersions of smooth manifolds into holomorphic Riemannian space forms of constant sectional curvature -1. We introduce a notion of first and second fundamental form ... [more ▼]

We approach the study of totally real immersions of smooth manifolds into holomorphic Riemannian space forms of constant sectional curvature -1. We introduce a notion of first and second fundamental form, we prove that they satisfy a similar version of the classic Gauss-Codazzi equations, and conversely that solutions of Gauss-Codazzi equations are immersion data of some equivariant map. This study has some interesting geometric consequences: 1) it provides a formalism to study immersions of surfaces into SL(2,C) and into the space of geodesics of H^3; 2) it generalizes the classical theory of immersions into non-zero curvature space forms, leading to a model for the transitioning of hypersurfaces among H^n, AdS^n, dS^n and S^n; 3) we prove that a holomorphic family of immersion data corresponds to a holomorphic family of immersions, providing an effective way to construct holomorphic maps into the SO(n,C)-character variety. In particular we will point out a simpler proof of the holomorphicity of the complex landslide; 4) we see how, under certain hypothesis, complex metrics on a surface (i.e. complex bilinear forms of its complexified tangent bundle) of constant curvature -1 correspond to pairs of projective surfaces with the same holonomy. Applying Bers Double Uniformization Theorem to this construction we prove a Uniformization Theorem for complex metrics on a surface. [less ▲]

Detailed reference viewed: 34 (0 UL)
See detailChancen der Jugendarbeit und non-formaler Bildung an Schulen
Biewers, Sandra UL

E-print/Working paper (2020)

Detailed reference viewed: 86 (11 UL)
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Peer Reviewed
See detailFiscal effects of migrants in Europe: a quantile regression approach
Joxhe, Majlinda UL; Zanaj, Skerdilajda UL; Scaramozzino, Pasquale

E-print/Working paper (2020)

In this paper, we explore the fiscal impact of immigrants in Europe applying a quantile regression approach to data from the European Survey on Living Conditions (EU-SILC) for the period 2007-2015. Our ... [more ▼]

In this paper, we explore the fiscal impact of immigrants in Europe applying a quantile regression approach to data from the European Survey on Living Conditions (EU-SILC) for the period 2007-2015. Our estimations show that not only on average but also in almost all income quantiles, the fiscal position of both European and non-European migrants is not significantly different from that of native citizens. Furthermore, non-EU migrants are net contributors as compared to the corresponding native citizens in the Netherlands and Belgium for various quantiles. Lastly, we examine the link between migrants’ fiscal position and the fiscal perception of native European citizens measured using ESS data. We find a conflicting relationship: countries where migrants are perceived negatively are instead countries where they are net fiscal contributors and vice versa. [less ▲]

Detailed reference viewed: 80 (1 UL)
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See detailDepressionen am Arbeitsplatz in Luxemburg: ein Handlungsfeld
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2020)

Im Rahmen dieser Newsletter wird das aktuelle Depressionsrisiko am Arbeitsplatz in Luxemburg vorgestellt. Im Vergleich zu anderen europäischen Ländern weist Luxemburg einen relativ hohen Anteil an ... [more ▼]

Im Rahmen dieser Newsletter wird das aktuelle Depressionsrisiko am Arbeitsplatz in Luxemburg vorgestellt. Im Vergleich zu anderen europäischen Ländern weist Luxemburg einen relativ hohen Anteil an Arbeitnehmern mit Depressionsrisiko. Weibliche Arbeitnehmer sind im Vergleich zu männlichen geringfügig häufiger von einem Depressionsrisiko betroffen. Differenziert nach Beruf sind vor allem Hilfsarbeitskräfte, Manager sowie Arbeitnehmer in Dienstleistungsberufen besonders von einem Depressionsrisiko betroffen. Arbeitnehmer mit Depressionsrisiko berichten über nachteilige Arbeitsbedingungen und weisen auch eine geringere Arbeitsplatzzufriedenheit sowie weitere gesundheitliche Probleme auf. [less ▲]

Detailed reference viewed: 73 (5 UL)
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See detailFluctuations for matrix-valued Gaussian processes
Jaramillo Gil, Arturo UL; Pardo Millan, Juan Carlos; Diaz Torres, Mario Alberto

E-print/Working paper (2020)

We consider a symmetric matrix-valued Gaussian process $Y^{(n)}=(Y^{(n)}(t);t\ge0)$ and its empirical spectral measure process $\mu^{(n)}=(\mu_{t}^{(n)};t\ge0)$. Under some mild conditions on the ... [more ▼]

We consider a symmetric matrix-valued Gaussian process $Y^{(n)}=(Y^{(n)}(t);t\ge0)$ and its empirical spectral measure process $\mu^{(n)}=(\mu_{t}^{(n)};t\ge0)$. Under some mild conditions on the covariance function of $Y^{(n)}$, we find an explicit expression for the limit distribution of $$Z_F^{(n)} := \left( \big(Z_{f_1}^{(n)}(t),\ldots,Z_{f_r}^{(n)}(t)\big) ; t\ge0\right),$$ where $F=(f_1,\dots, f_r)$, for $r\ge 1$, with each component belonging to a large class of test functions, and $$ Z_{f}^{(n)}(t) := n\int_{\R}f(x)\mu_{t}^{(n)}(\ud x)-n\E\left[\int_{\R}f(x)\mu_{t}^{(n)}(\ud x)\right].$$ More precisely, we establish the stable convergence of $Z_F^{(n)}$ and determine its limiting distribution. An upper bound for the total variation distance of the law of $Z_{f}^{(n)}(t)$ to its limiting distribution, for a test function $f$ and $t\geq0$ fixed, is also given. [less ▲]

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See detailA newform theory for Katz modular forms
Berhanu, Daniel UL

E-print/Working paper (2020)

In this paper, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old ... [more ▼]

In this paper, a strong multiplicity one theorem for Katz modular forms is studied. We show that a cuspidal Katz eigenform which admits an irreducible Galois representation is in the level and weight old space of a uniquely associated Katz newform. We also set up multiplicity one results for Katz eigenforms which have reducible Galois representation. [less ▲]

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See detailOptimized Collision Search for STARK-Friendly Hash Challenge Candidates
Udovenko, Aleksei UL

E-print/Working paper (2020)

In this note, we report several solutions to the STARK-Friendly Hash Challenge: a competition with the goal of finding collisions for several hash functions designed specifically for zero-knowledge proofs ... [more ▼]

In this note, we report several solutions to the STARK-Friendly Hash Challenge: a competition with the goal of finding collisions for several hash functions designed specifically for zero-knowledge proofs (ZKP) and multiparty computations (MPC). We managed to find collisions for 3 instances of 91-bit hash functions. The method used is the classic parallel collision search with distinguished points from van Oorshot and Wiener (1994). As this is a general attack on hash functions, it does not exhibit any particular weakness of the chosen hash functions. The crucial part is to optimize the implementations to make the attack cost realistic, and we describe several arithmetic tricks. [less ▲]

Detailed reference viewed: 139 (5 UL)
See detailThe Supply of Hours Worked and Endogenous Growth Cycles
Irmen, Andreas UL; Iong, Ka-Kit UL

E-print/Working paper (2020)

We show that declining hours of work per worker in conjunction with a growing work force may give rise to growth cycles. This is accomplished in an overlapping generations model where individuals are ... [more ▼]

We show that declining hours of work per worker in conjunction with a growing work force may give rise to growth cycles. This is accomplished in an overlapping generations model where individuals are endowed with Boppart-Krusell preferences (Boppart and Krusell (2020)), i. e., the wage elasticity of their supply of hours worked is negative. On the supply side, economic growth is due to the expansion of consumption-good varieties through endogenous research. We show that a sufficiently negative equilibrium elasticity of the individual supply of hours worked to an expansion in the set of consumption-good varieties opens up the possibility of growth cycles where the economy fluctuates between two regimes, one with and the other without an active research sector. We identify period-2 and period-3 cycles, conclude with Li and Yorke (1975) that cycles of any periodicity exists, and generalize our findings to period-n cycles. We show that the possibility of cycles occurs under empirically plausible conditions. Throughout, we emphasize that the economics of cycles is linked to the intergenerational trade of shares and their pricing in the asset market. [less ▲]

Detailed reference viewed: 25 (0 UL)
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See detailOn the distribution of coefficients of half-integral weight modular forms and the Bruinier-Kohnen Conjecture
Inam, Ilker; Demirkol Özkaya, Zeynep; Tercan, Elif et al

E-print/Working paper (2020)

This work represents a systematic computational study of the distribution of the Fourier coefficients of cuspidal Hecke eigenforms of level Gamma_0(4) and half-integral weights. Based on substantial ... [more ▼]

This work represents a systematic computational study of the distribution of the Fourier coefficients of cuspidal Hecke eigenforms of level Gamma_0(4) and half-integral weights. Based on substantial calculations, the question is raised whether the distribution of normalised Fourier coefficients with bounded indices can be approximated by a generalised Gaussian distribution. Moreover, it is argued that the apparent symmetry around zero of the data lends strong evidence to the Bruinier-Kohnen Conjecture on the equidistribution of signs and even suggests the strengthening that signs and absolute values are distributed independently. [less ▲]

Detailed reference viewed: 29 (0 UL)
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See detailLocal constancy for reductions of two-dimensional crystalline representations
Torti, Emiliano UL

E-print/Working paper (2020)

Detailed reference viewed: 10 (1 UL)
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Peer Reviewed
See detailUniversal Hall conductance scaling in non-Hermitian Chern insulators
Groenendijk, Solofo UL; Schmidt, Thomas UL; Meng, Tobias

E-print/Working paper (2020)

Detailed reference viewed: 34 (0 UL)
See detailTasks, Technology, and Factor Prices in the Neoclassical Production Sector
Irmen, Andreas UL

E-print/Working paper (2020)

This paper introduces tasks into the neoclassical production sector. Competitive firms choose the profit-maximizing amounts of factor-specific tasks that determine their factor demands and output supplies ... [more ▼]

This paper introduces tasks into the neoclassical production sector. Competitive firms choose the profit-maximizing amounts of factor-specific tasks that determine their factor demands and output supplies. We show that the effect of factor-augmenting technical change on relative and absolute factor prices can be decomposed into a productivity effect and a task-demand effect of opposite sign. These effects appear since the novel task-based approach distinguishes between the demands for tasks and the demands for factors. This perspective provides a new intuition for the emergence of relative and absolute factor biases and the role of the elasticity of substitution. [less ▲]

Detailed reference viewed: 25 (0 UL)
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See detailArtificial Intelligence in Finance: Putting the Humans in the Loop
Zetzsche, Dirk Andreas UL; Tang, Brian; Buckley, Ross et al

E-print/Working paper (2020)

Detailed reference viewed: 31 (0 UL)
See detailAutomation, Growth, and Factor Shares in the Era of Population Aging
Irmen, Andreas UL

E-print/Working paper (2020)

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of ... [more ▼]

How does population aging affect economic growth and factor shares in times of increasingly automatable production processes? The present paper addresses this question in a new macroeconomic model of automation where competitive firms perform tasks to produce output. Tasks require labor and machines as inputs. New machines embody superior technological knowledge and substitute for labor in the performance of tasks. The incentive to automate is stronger if wages are higher. Automation is shown to boost the aggregate demand for labor if and only if the incentives to automate are strong enough and to reduce the labor share. These predictions obtain even though automation is labor-augmenting in the reduced-form production function. Population aging due to a higher longevity or a decline in fertility may strengthen or weaken the incentives to automate. Irrespective of its source, population aging is predicted to increase the growth rate of per-capita GDP in the short and in the long run. The short-run effect of higher longevity on the labor share is positive whereas the effect of a declining fertility is negative. In the long run, population aging reduces the labor share. [less ▲]

Detailed reference viewed: 54 (0 UL)
Peer Reviewed
See detailSmall Scale CLTs for the Nodal Length of Monochromatic Waves
Dierickx, Gauthier; Nourdin, Ivan UL; Peccati, Giovanni UL et al

E-print/Working paper (2020)

Detailed reference viewed: 43 (4 UL)
See detailThe solution of the immigrant paradox: aspirations and expectations of children of migrants
Beine, Michel UL; Montes Vinas, Ana Cecilia UL; Zanaj, Skerdilajda UL

E-print/Working paper (2020)

In this paper, we push forward the hypothesis that misalignment between expectations and aspirations crucially affects the educational outcomes of young adults. Using AddHealth, a dataset of 20,774 ... [more ▼]

In this paper, we push forward the hypothesis that misalignment between expectations and aspirations crucially affects the educational outcomes of young adults. Using AddHealth, a dataset of 20,774 adolescents between the grades 7-12, we show that the difference in school performance between migrant children and natives lies within the aspirations and expectations that migrant children form. More specifically, we find that positive misalignment between aspirations and expectations is a driving force for higher effort and better education outcomes of immigrant teenagers in the USA. This force resolves the well-known immigrant paradox. Furthermore, this result is specific to migrant children and does not hold for second-generation migrant pupils. [less ▲]

Detailed reference viewed: 103 (14 UL)
See detailChallenging the Olympic Charter at the Swiss OECD National Contact Point
Baglayan, Basak UL

E-print/Working paper (2020)

Detailed reference viewed: 136 (0 UL)
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See detailPreservation of DNA Privacy During the Large Scale Detection of COVID-19
Hollenstein, Marcel; Naccache, David; Roenne, Peter UL et al

E-print/Working paper (2020)

Detailed reference viewed: 45 (0 UL)
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See detailThe Quest and Hope of Majorana Zero Modes in Topological Superconductor for Fault Tolerant Quantum Computing: An Introductory Overview
Ayukaryana, Nur R.; Fauzi, Mohammad H; Hasdeo, Eddwi Hesky UL

E-print/Working paper (2020)

Ettore Majorana, in his short life, unintendedly has uncovered the most profound problem in quantum computation by his discovery of Majorana fermion, a particle which is its own anti-particle. Owing to ... [more ▼]

Ettore Majorana, in his short life, unintendedly has uncovered the most profound problem in quantum computation by his discovery of Majorana fermion, a particle which is its own anti-particle. Owing to its non-Abelian exchange statistics, Majorana fermions may act as a qubit for a universal quantum computer which is fault-tolerant. The existence of such particle is predicted in mid-gap states (zero modes) of a topological superconductor as bound states that have a highly entangled degenerate ground state. This introductory overview will focus on the simplest theoretical proposals of Majorana fermions for topological quantum computing in superconducting systems, emphasizing the quest from the scalability problem of quantum computer to its possible solution with topological quantum computer employing non-Abelian anyons on various platforms of certain Majorana fermion signature encountered. [less ▲]

Detailed reference viewed: 30 (1 UL)
See detailCausal dynamical modelling predicts novel regulatory genes of FOXP3 in human regulatory T cells
Sawlekar, Rucha UL; Magni, Stefano UL; Chapelle, Christophe et al

E-print/Working paper (2020)

Detailed reference viewed: 80 (5 UL)
See detailGeographical Stratification of Green Urban Areas
Picard, Pierre M UL; Tran, Thi Thu Huyen UL

E-print/Working paper (2020)

This paper studies the provision of urban green areas in cities when residents havepreferences for the size of and access to those areas. At the optimum, the number ofurban green spaces is a non-monotone ... [more ▼]

This paper studies the provision of urban green areas in cities when residents havepreferences for the size of and access to those areas. At the optimum, the number ofurban green spaces is a non-monotone function of distance to the city centre, whilethe sizes and distances to other urban green areas increase as one moves to the urbanfringe. This paper empirically investigates those properties for the 300 largest Europeancities by using the GMES Urban Atlas database (European Environmental Agency).The empirical analysis confirms the non-monotone relationship between the numberof urban green spaces and the distance to the city centre. The distance between twoparks also increases as one moves toward the urban fringe. Finally, richer cities areassociated with a denser network of urban green areas. [less ▲]

Detailed reference viewed: 71 (1 UL)
Peer Reviewed
See detailSecure Vehicular Communications through Reconfigurable Intelligent Surfaces
Ai, Yun; Figueiredo, Felipe A. P. de; Kong, Long UL et al

E-print/Working paper (2020)

Detailed reference viewed: 28 (3 UL)
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See detailApproximation of Riemannian measures by Stein’s method
Thompson, James UL

E-print/Working paper (2020)

Detailed reference viewed: 77 (2 UL)
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See detailArtificial Intelligence in Space
Long, George Anthony; Santos, Cristiana; Rapp, Lucien et al

E-print/Working paper (2020)

Detailed reference viewed: 70 (1 UL)
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See detailAfter Libra, Digital Yuan and COVID-19: Central Bank Digital Currencies and the New World of Money and Payment Systems
Zetzsche, Dirk Andreas UL; Arner, Douglas; Buckley, Ross et al

E-print/Working paper (2020)

Detailed reference viewed: 108 (1 UL)
Peer Reviewed
See detailAn Overview of Generic Tools for Information-Theoretic Secrecy Performance Analysis over Wiretap Fading Channels
Kong, Long UL; Ai, Yun; Lei, Lei UL et al

E-print/Working paper (2020)

An alternative or supplementary approach named as physical layer security has been proposed to afford an extra security layer on top of the conventional cryptography technique. In this paper, an overview ... [more ▼]

An alternative or supplementary approach named as physical layer security has been proposed to afford an extra security layer on top of the conventional cryptography technique. In this paper, an overview of secrecy performance investigations over the classic Alice-Bob-Eve wiretap fading channels is conducted. On the basis of the classic wiretap channel model, we have comprehensively listed and thereafter compared the existing works on physical layer secrecy analysis considering the small-scale, large-scale, composite, and cascaded fading channel models. Exact secrecy metrics expressions, including secrecy outage probability (SOP), the probability of non-zero secrecy capacity (PNZ), average secrecy capacity (ASC), and secrecy bounds, including the lower bound of SOP and ergodic secrecy capacity, are presented. In order to encompass the aforementioned four kinds of fading channel models with a more \textit{generic} and \textit{flexible} distribution, the mixture gamma (MG), mixture of Gaussian (MoG), and Fox's $H$-function distributions are three useful candidates to largely include the above-mentioned four kinds of fading channel models. It is shown that they are flexible and general when assisting the secrecy analysis to obtain closed-form expressions. Their advantages and limitations are also highlighted. Conclusively, these three approaches are proven to provide a unified secrecy analysis framework and can cover all types of independent wiretap fading channel models. Apart from those, revisiting the existing secrecy enhancement techniques based on our system configuration, the on-off transmission scheme, jamming approach (including artificial noise (AN) & artificial fast fading (AFF)), antenna selection, and security region are presented. [less ▲]

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See detailFast computation of half-integral weight modular forms
Inam, Ilker; Wiese, Gabor UL

E-print/Working paper (2020)

To study statistical properties of modular forms, including for instance Sato-Tate like problems, it is essential to have a large number of Fourier coefficients. In this article, we exhibit three bases ... [more ▼]

To study statistical properties of modular forms, including for instance Sato-Tate like problems, it is essential to have a large number of Fourier coefficients. In this article, we exhibit three bases for the space of modular forms of any half-integral weight and level 4, which have the property that many coefficients can be computed (relatively) quickly on a computer. [less ▲]

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See detailFrobenius Extension II
Khovanov, Mikhail; Robert, Louis-Hadrien UL

E-print/Working paper (2020)

The first two sections of the paper provide a convenient scheme and additional diagrammatics for working with Frobenius extensions responsible for key flavors of equivariant SL(2) link homology theories ... [more ▼]

The first two sections of the paper provide a convenient scheme and additional diagrammatics for working with Frobenius extensions responsible for key flavors of equivariant SL(2) link homology theories. The goal is to clarify some basic structures in the theory and propose a setup to work over sufficiently non-degenerate base rings. The third section works out two related SL(2) evaluations for seamed surfaces. [less ▲]

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See detailQuantitative two-scale stabilization on the Poisson space
Lachièze-Rey, Raphaël; Peccati, Giovanni UL; Yang, Xiaochuan

E-print/Working paper (2020)

Detailed reference viewed: 36 (2 UL)
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Peer Reviewed
See detailSouth Africa’s incomplete transition towards socio-economic justice: A case study on inequality and populism
Owiso, Owiso UL; Boshoff, Elsabé

E-print/Working paper (2020)

South Africa is currently one of the world’s most unequal countries, with massive income inequality, millions of people living in poverty without access to basic services and amenities, unemployment rates ... [more ▼]

South Africa is currently one of the world’s most unequal countries, with massive income inequality, millions of people living in poverty without access to basic services and amenities, unemployment rates consistently above 20% and the top 10% of the population receiving two thirds of the total income. Government economic policies on poverty reduction in the decades since the advent of democracy in South Africa in 1994 have been unable to eradicate the extreme racialised inequality which was the basis of the 342 years of colonialism and apartheid which were characterised by systematic dispossession and socio-economic marginalisation of South Africa’s majority Black population and the systematic privileging of the minority White population. While this history is not the primary focus of this paper, it nonetheless provides useful context. The paper’s primary focus is on the more recent normative and legal challenges of post-1994 South Africa that have resulted in further entrenching socio-economic inequality and contributing to the rise of populism. In this paper we argue that the dire living conditions of a large proportion of the population and disillusionment with the State’s ability to deliver on its promises in this regard, along with the poor implementation of social and economic rights have led to the development of a populist culture in South African politics. [less ▲]

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See detailPoverty in Russia: the Role of the Marital Status and Gender
Zanaj, Skerdilajda UL

E-print/Working paper (2020)

Detailed reference viewed: 40 (2 UL)
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See detailFintech Toolkit: Smart Regulatory and Market Approaches to Financial Technology Innovation
Zetzsche, Dirk Andreas UL; Arner, Douglas; Buckley, Ross et al

E-print/Working paper (2020)

Detailed reference viewed: 74 (0 UL)
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See detailThe signature method : a new tool enhancing time series clustering
Clausel, Marianne; Lejay, Antoine; Terraza, Virginie UL

E-print/Working paper (2020)

Detailed reference viewed: 45 (0 UL)
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See detailAssessing suppression strategies against epidemicoutbreaks like COVID-19: the SPQEIR model
Proverbio, Daniele UL; Kemp, Francoise UL; Magni, Stefano UL et al

E-print/Working paper (2020)

The current COVID-19 outbreak represents a most serious challenge for societies worldwide. It isendangering the health of millions of people, and resulting in severe socioeconomic challenges dueto lock ... [more ▼]

The current COVID-19 outbreak represents a most serious challenge for societies worldwide. It isendangering the health of millions of people, and resulting in severe socioeconomic challenges dueto lock-down measures. Governments worldwide aim to devise exit strategies to revive the economywhile keeping the pandemic under control. The problem is that the effects of distinct measures arenot well quantified. This paper compares several suppression approaches and potential exit strategiesusing a new extended epidemic SEIR model. It concludes that while rapid and strong lock-down isan effective pandemic suppression measure, a combination of other strategies such as social distanc-ing, active protection and removal can achieve similar suppression synergistically. This quantitativeunderstanding will support the establishment of mid- and long-term interventions. Finally, the paperprovides an online tool that allows researchers and decision makers to interactively simulate diversescenarios with our model. [less ▲]

Detailed reference viewed: 131 (3 UL)
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See detailRobust ambiguity for contact tracing
Mestel, David UL

E-print/Working paper (2020)

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See detailNormal approximation for functions of hidden Markov models
Kerchev, George UL

E-print/Working paper (2020)

Detailed reference viewed: 49 (3 UL)
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See detailIntersymbol and Intercarrier Interference in OFDM Systems: Unified Formulation and Analysis
Cruz–Roldán, Fernando; Alves Martins, Wallace UL; García, Fausto G. et al

E-print/Working paper (2020)

A unified matrix formulation is presented for the analysis of intersymbol and intercarrier interference in orthogonal frequency-division multiplexing (OFDM) systems. The proposed formulation relies on six ... [more ▼]

A unified matrix formulation is presented for the analysis of intersymbol and intercarrier interference in orthogonal frequency-division multiplexing (OFDM) systems. The proposed formulation relies on six parameters and allows studying various schemes, including those with windowing in the transmitter and/or in the receiver (called windowed OFDM systems), which may add cyclic suffix and/or cyclic prefix (CP), besides the conventional CP-OFDM. The proposed framework encompasses seven different OFDM systems. It considers the overlap-and-add procedure performed in the transmitter of windowed OFDM systems, being jointly formulated with the channel convolution. The intersymbol and intercarrier interference, caused when the order of the channel impulse response is higher than the number of CP samples, is characterized. A new equivalent channel matrix that is useful for calculating both the received signal and the interference power is defined and characterized. Unlike previous works, this new channel matrix has no restrictions on the length of the channel impulse response, which means that the study is not constrained to the particular case of two or three data blocks interfering in the received signal. Theoretical expressions for the powers of three different kinds of interference are derived. These expressions allow calculating the signal-to-interference-plus-noise ratio, useful for computing the data rate of each OFDM system. The proposed formulation is applied to realistic examples, showing its effectiveness through comparisons based on numerical performance assessments of the considered OFDM systems. [less ▲]

Detailed reference viewed: 37 (0 UL)
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See detailTropical Fock-Goncharov coordinates for SL3-webs on surfaces I: construction
Sun, Zhe UL; Douglas, Daniel C.

E-print/Working paper (2020)

For a finite-type surface S, we study a preferred basis for the commutative algebra C[XSL3(C)(S)] of regular functions on the SL3(C)-character variety, introduced by Sikora and Westbury. These basis ... [more ▼]

For a finite-type surface S, we study a preferred basis for the commutative algebra C[XSL3(C)(S)] of regular functions on the SL3(C)-character variety, introduced by Sikora and Westbury. These basis elements come from the trace functions associated to certain tri-valent graphs embedded in the surface S. We show that this basis can be naturally indexed by positive integer coordinates, defined by Knutson-Tao rhombus inequalities. These coordinates are related, by the geometric theory of Fock and Goncharov, to the tropical points at infinity of the dual version of the character variety. [less ▲]

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See detailIdentifiability of Finite Mixture Models with underlying Normal Distribution
Noel, Cédric; Schiltz, Jang UL

E-print/Working paper (2020)

In this paper, we show under which conditions generalized finite mixture with underlying normal distribution are identifiable in the sense that a given dataset leads to a uniquely determined set of model ... [more ▼]

In this paper, we show under which conditions generalized finite mixture with underlying normal distribution are identifiable in the sense that a given dataset leads to a uniquely determined set of model parameter estimations up to a permuta-tion of the clusters. [less ▲]

Detailed reference viewed: 31 (0 UL)
See detailEndogenous Task-Based Technical Change - Factor Scarcity and Factor Prices -
Irmen, Andreas UL

E-print/Working paper (2020)

This paper develops a static model of endogenous task-based technical progress to study how factor scarcity induces technological progress and changes in factor prices. The equilibrium technology is multi ... [more ▼]

This paper develops a static model of endogenous task-based technical progress to study how factor scarcity induces technological progress and changes in factor prices. The equilibrium technology is multi-dimensional and not strongly factor-saving in the sense of Acemoglu (2010). Nevertheless, labor scarcity induces labor productivity growth. There is a weak but no strong absolute equilibrium bias. This model provides a plausible interpretation of the famous contention of Hicks (1932) about the role of factor prices and factor endowments for induced innovations. It may serve as a micro-foundation for canonical macro-economic models. Moreover, it accommodates features like endogenous factor supplies and a binding minimum wage. [less ▲]

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Peer Reviewed
See detailJust because they say it is sustainable development, it does not mean that it is: Sustainable development as a master-signifier in Swiss urban and regional planning
Carr, Constance UL

E-print/Working paper (2020)

With stunning green landscapes, exemplary public transport, and picturesque walkable cities, Switzerland often occupies the public imaginary of a place that has tackled sustainable development. This ... [more ▼]

With stunning green landscapes, exemplary public transport, and picturesque walkable cities, Switzerland often occupies the public imaginary of a place that has tackled sustainable development. This research, however, looks under the hood and finds that this development path supports not only modes of capital accumulation, but also certain less sustainable patterns of development and governance. This paper examines this apparent paradox by looking at the role of sustainable development as a master-signifier in Swiss urban development processes. Empirical observations were made in the Glatt Valley of Switzerland, where governing officials of small municipalities are confronted with coordinating urban development under growth pressure within cantonal and federal policy frameworks that claim sustainable development. It can be seen that sustainable development is an empty master-signifier that policy makers engage to justify the quilting of a certain hegemonic discourses of power that reflect in further uneven urban development. By reproducing business as usual market-led urban growth, fragmentation is maintained as are social spatial disparities are entrenched. [less ▲]

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See detailOn the structure of symmetric $n$-ary bands
Devillet, Jimmy UL; Mathonet, Pierre

E-print/Working paper (2020)

We study the class of symmetric $n$-ary bands. These are $n$-ary semigroups $(X,F)$ such that $F$ is invariant under the action of permutations and idempotent, i.e., satisfies $F(x,\ldots,x)=x$ for all $x ... [more ▼]

We study the class of symmetric $n$-ary bands. These are $n$-ary semigroups $(X,F)$ such that $F$ is invariant under the action of permutations and idempotent, i.e., satisfies $F(x,\ldots,x)=x$ for all $x\in X$. We first provide a structure theorem for these symmetric $n$-ary bands that extends the classical (strong) semilattice decomposition of certain classes of bands. We introduce the concept of strong $n$-ary semilattice of $n$-ary semigroups and we show that the symmetric $n$-ary bands are exactly the strong $n$-ary semilattices of $n$-ary extensions of Abelian groups whose exponents divide $n-1$. Finally, we use the structure theorem to obtain necessary and sufficient conditions for a symmetric $n$-ary band to be reducible to a semigroup. [less ▲]

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See detailQuality of Work – Project. Forschungsbericht zur Erhebungswelle 2020
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2020)

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2020 zum achten Mal durchgeführt. Ziel des ... [more ▼]

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2020 zum achten Mal durchgeführt. Ziel des Surveys ist es, die erlebte Arbeitssituation und -qualität luxemburgischer Arbeitnehmer zu erfassen. Der vorliegende Bericht dokumentiert die psychometrische Testung der Güte des aktuellen Erhebungsinstruments. In einem ersten Schritt erfolgt eine Beschreibung der Befragungsumstände sowie eine demographische Beschreibung der Stichprobe. Da die Erhebung 2020 als Mixed-Mode-Design – telefonische als auch Online-Befragung – durchgeführt wurde, wird auch analysiert, ob Stichprobenunterschiede zwischen den beiden Erhebungsmodi auftreten. Außerdem wird geklärt, ob es hinsichtlich demographischer Eigenschaften der Befragten, hinsichtlich der QoW-Skalen oder hinsichtlich verschiedener Well-Being-Maße zu systematischen Ausfällen seit der letzten Welle gekommen ist. Dann erfolgt eine Prüfung der Items der QoW-, der QoE- und der Well-Being-Skalen (fehlende Werte, verteilungsbeschreibender Maßzahlen, Balkendiagramme). In einem nächsten Schritt werden die Skalen mittels verschiedener Reliabilitätsstatistiken (Cronbach’s Alpha, Korrelationsanalysen der Items) sowie Koeffizienten zur Beschreibung der Skalenverteilung überprüft. Außerdem werden die Zusammenhänge der Skalen mittels Korrelationsanalysen überprüft. Im Anschluss daran wird die unterstellte Faktorenstruktur mittels konfirmatorischer Faktoren-analysen getestet. Die QoW- und QoE-Skalen werden außerdem auf verschiedene Well-Being-Skalen regressiert, um deren Relevanz für den QoW-Index zu prüfen. Ebenso werden einige Längsschnitt-Regressionsanalysen durchgeführt, um zu überprüfen ob einige Arbeits-bedingungen längerfristige Effekte auf das Well-Being der Arbeitnehmer aufweisen. Die QoW-Befragung 2020 hat außerdem das Schwerpunktthema „Arbeitsbedingungen in der Corona-Krise“ behandelt. Die Güte der Konstrukte zu diesem Thema wird ebenfalls geprüft. Im Anschluss werden dann Zusammenhänge mit den QoW-, QoE- und Well-Being-Skalen berechnet. Abschließend wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Empfehlungen bezüglich zukünftiger Befragungen gegeben. [less ▲]

Detailed reference viewed: 53 (2 UL)
See detailA Welfare Evaluation of Green Urban Areas
Picard, Pierre M UL; Tran, Huyen

E-print/Working paper (2020)

Urban green areas cover more than 6% of urban land in Europe. This paper quan-tifies the impact of urban green areas on city structures for more than 300 Europeancities. It discusses the economic effects ... [more ▼]

Urban green areas cover more than 6% of urban land in Europe. This paper quan-tifies the impact of urban green areas on city structures for more than 300 Europeancities. It discusses the economic effects of the local amenity produced by green urbanareas using an urban economics model with various set of preferences. It estimatesthose models using data on detailed residential land uses, green urban areas and popu-lation density. It finally assesses the economic effects of reducing urban green areas incounterfactual exercises where cities are closed and open to migration and green urbanland is converted to residential plots or not. By this strategy, the economic assess-ment accounts for the general equilibrium effects through endogenous land prices andresidential space and location choices. It shows that the gross benefits of urban greenareas are substantial. A uniform removal of half of the urban green areas is equivalentto 6-9% reduction of household annual income. However, the conversion of those areasto residential plots brings a net gain of approximately 4% [less ▲]

Detailed reference viewed: 28 (0 UL)
See detailExplaining the Decline in the US Labor Share: Taxation and Automation DEM Discussion Paper 20-2020, University of Luxembourg
Irmen, Andreas UL; Heer, Burkhard; Süssmuth, Bernd

E-print/Working paper (2020)

This study provides evidence for the US that the secular decline in the labor share is not only explained by technical change or globalization, but also by the dynamics of factor taxation, automation ... [more ▼]

This study provides evidence for the US that the secular decline in the labor share is not only explained by technical change or globalization, but also by the dynamics of factor taxation, automation capital, and population growth. First, we empirically find indications of co-integration for the 1974-2008 period. Permanent effects on factor shares emanate from relative factor taxation. The latter also have a lasting effect on the use of robots. Variance decompositions reveal that taxing contributes to changes in the two income shares and in automation capital. Second, we analyse and calibrate a neoclassical growth model extended to include factor taxation, automation capital, and capital adjustment costs. The model is able to replicate the dynamics of the observed functional income distribution in the US during the 1965-2015 period. Counterfactual experiments suggest that the fall in the labor share would have been significantly smaller if labor and capital income tax rates had remained at their respective level of the 1960s. [less ▲]

Detailed reference viewed: 36 (0 UL)
See detailEnquête transfrontalière sur le vécu de la littérature au lycée
Raus, Tonia UL; Promonet, Aurore

E-print/Working paper (2020)

Detailed reference viewed: 27 (0 UL)
See detailWidely-distributed Radar Imaging Based on Consensus ADMM
Hu, Ruizhi UL; Rao, Bhavani Shankar Mysore Rama; Murtada, Ahmed et al

E-print/Working paper (2020)

Detailed reference viewed: 40 (15 UL)
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See detailDecentralized Finance (DeFi)
Zetzsche, Dirk Andreas UL; Buckley, Ross; Arner, Douglas

E-print/Working paper (2020)

Detailed reference viewed: 152 (4 UL)
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See detailLegal Readiness for Climate Finance: The case of Bangladesh towards a transition to climate resilience
Alexandraki, Chrysa UL

E-print/Working paper (2020)

Even though the Paris Agreement posits the need to align overall financial flows with low-carbon and climate-resilient development in the heart of its objectives, developing countries face ample ... [more ▼]

Even though the Paris Agreement posits the need to align overall financial flows with low-carbon and climate-resilient development in the heart of its objectives, developing countries face ample constraints in mitigating and adapting to climate change, while concomitantly embarking on reconciling the curbing of climate change with development concerns. Climate finance constitutes an enabling means not only for assisting developing countries in building capacities and enabling environments to address climate change in compliance with their commitments under the Paris Agreement, but most importantly for ushering a long-term development shift towards sustainability. This article furthers the discourse on what it means to be ‘legally ready’ for climate finance. It argues that legal reforms present a means to overcome legal barriers undermining climate finance effectiveness in developing countries, aimed at mainstreaming climate change considerations across all sectors and national policies, stimulating climate-related flows from all sources of finance, and instituting a paradigm shift towards climate-resilient development. First, it elaborates on the role of law in building climate finance readiness, the key legal barriers encountered in developing countries, and the main legal approaches and regulatory tools likely to enhance the four main capacities required to be ready for climate finance. Second, it illustrates the laws and policies currently implemented in Bangladesh concerning the country’s readiness for climate finance. The article concludes premised on the case study of Bangladesh that legal reforms are essential in developing countries, in order to ensure long-term climate finance effectiveness steering transformative changes. [less ▲]

Detailed reference viewed: 117 (41 UL)
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See detailpatRoon: Open Source Software Platform for Environmental Mass Spectrometry Based Non-target Screening
Helmus, Rick; ter Laak, Thomas; van Wezel, Annemarie et al

E-print/Working paper (2020)

Detailed reference viewed: 84 (0 UL)
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See detailIn-work poverty in times of pandemic
Ratti, Luca UL

E-print/Working paper (2020)

The coronavirus crisis is exacerbating in-work poverty in the EU—and a powerful raft of labour-market and welfare measures is needed for an adequate response.

Detailed reference viewed: 59 (11 UL)
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See detailQuality of Work – Project. Forschungsbericht zur Erhebungswelle 2019
Sischka, Philipp UL; Steffgen, Georges UL

E-print/Working paper (2020)

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2019 zum siebten Mal durchgeführt. Ziel des ... [more ▼]

Der „Quality of Work Index Luxembourg“ (QoW)-Survey, der von der Universität Luxemburg und der luxemburgischen Chambre des Salariés konzipiert wurde, wurde 2019 zum siebten Mal durchgeführt. Ziel des Surveys ist es, die erlebte Arbeitssituation und -qualität luxemburgischer Arbeitnehmer zu erfassen. Der vorliegende Bericht dokumentiert die psychometrische Testung der Güte des aktuellen Erhebungsinstruments. In einem ersten Schritt erfolgt eine Beschreibung der Befragungsumstände sowie eine demographische Beschreibung der Stichprobe. Da die Erhebung 2019 als Mixed-Mode-Design – telefonische als auch Online-Befragung – durchgeführt wurde, wird auch analysiert, ob Stichprobenunterschiede zwischen den beiden Erhebungsmodi auftreten. Außerdem wird geklärt, ob es hinsichtlich demographischer Eigenschaften der Befragten, hinsichtlich der QoW-Skalen oder hinsichtlich verschiedener Well-Being-Maße zu systematischen Ausfällen seit der letzten Welle gekommen ist. Dann erfolgt eine Prüfung der Items der QoW-, der Beschäftigungsqualität- und der Well-Being-Skalen (fehlende Werte, verteilungsbeschreibender Maßzahlen, Balkendiagramme). In einem nächsten Schritt werden die Skalen mittels verschiedener Reliabilitätsstatistiken (Cronbach’s Alpha, Korrelationsanalysen der Items) sowie Koeffizienten zur Beschreibung der Skalenverteilung überprüft. Außerdem werden die Zusammenhänge der Skalen mittels Korrelationsanalysen überprüft. Im Anschluss daran wird die unterstellte Faktorenstruktur mittels konfirmatorischer Faktoren-analysen getestet. Die QoW- und Beschäftigungsqualität-Skalen werden außerdem auf verschiedene Well-Being-Skalen regressiert, um deren Relevanz für den QoW-Index zu prüfen. Ebenso werden einige Längsschnitt-Regressionsanalysen durchgeführt, um zu überprüfen ob einige Arbeitsbedingungen längerfristige Effekte auf das Well-Being der Arbeitnehmer aufweisen. Die QoW-Befragung 2019 hat außerdem das Schwerpunktthema „Leadership-Stil und Basic Needs“ behandelt. Die Güte der Skalen zu diesem Thema wird ebenfalls geprüft. Im Anschluss werden dann Korrelationen mit den QoW-, Beschäftigungsqualität- und Well-Being-Skalen berechnet. Abschließend wird das gesamte Erhebungsinstrument zusammenfassend diskutiert und Empfehlungen bezüglich zukünftiger Befragungen gegeben. [less ▲]

Detailed reference viewed: 47 (1 UL)
See detailThe Structure of Behavioral Data
Defossez, Aurélien; Ansarinia, Morteza UL; Clocher, Brice UL et al

E-print/Working paper (2020)

For more than a century, scientists have been collecting behavioral data--an increasing fraction of which is now being publicly shared so other researchers can reuse them to replicate, integrate or extend ... [more ▼]

For more than a century, scientists have been collecting behavioral data--an increasing fraction of which is now being publicly shared so other researchers can reuse them to replicate, integrate or extend past results. Although behavioral data is fundamental to many scientific fields, there is currently no widely adopted standard for formatting, naming, organizing, describing or sharing such data. This lack of standardization is a major bottleneck for scientific progress. Not only does it prevent the effective reuse of data, it also affects how behavioral data in general are processed, as non-standard data calls for custom-made data analysis code and prevents the development of efficient tools. To address this problem, we develop the Behaverse Data Model (BDM), a standard for structuring behavioral data. Here we focus on major concepts in behavioral data, leaving further details and developments to the project's website (https://behaverse.github.io/data-model/). [less ▲]

Detailed reference viewed: 59 (3 UL)
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See detailDigital Finance & The COVID-19 Crisis
Zetzsche, Dirk Andreas UL; Arner, Douglas; Barberis, Janos Nathan et al

E-print/Working paper (2020)

Detailed reference viewed: 174 (0 UL)
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See detailEstimating the number of infected persons
Baraud, Yannick UL; Nourdin, Ivan UL; Peccati, Giovanni UL

E-print/Working paper (2020)

The aim of this paper is to provide a confidence interval on the number of infected persons by COVID-19 within the population from the number of deaths reported in the hospitals and the mortality rate ... [more ▼]

The aim of this paper is to provide a confidence interval on the number of infected persons by COVID-19 within the population from the number of deaths reported in the hospitals and the mortality rate (that is assumed to be known). [less ▲]

Detailed reference viewed: 201 (25 UL)
Peer Reviewed
See detailOn Performance Characterization of Cascaded Multiwire-PLC/MIMO-RF Communication System
Ai, Yun; Kong, Long UL; Cheffena, Michael et al

E-print/Working paper (2020)

Detailed reference viewed: 28 (4 UL)
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See detailResearch Frameworks in Comparative Public Law: Law as Category, as Source and as Variable
Hofmann, Herwig UL

E-print/Working paper (2020)

This chapter outlines some basic approaches to identifying frameworks of comparative research. It first argues that establishing comparative frameworks is a task ubiquitous to legal methodology. The ... [more ▼]

This chapter outlines some basic approaches to identifying frameworks of comparative research. It first argues that establishing comparative frameworks is a task ubiquitous to legal methodology. The framework is the decisive factor identifying the comparators and allowing assessment of similarities and differences. The framework allows identification of what to compare, how many commonalities the comparators have to start with, and how ‘foreign’ the two elements subject to comparison may be, so as to facilitate meaningful comparison. The chapter thus shows how comparative frameworks are flexible in serving the objectives defined by comparative scholars. This fluid feature of the framework of comparison and the relatively ubiquitous nature of the comparative method is the backdrop to the discussions in this chapter, critically reviewing three major frameworks identified by the objectives of the comparative approach: law as ‘category’, as ‘source’, and as ‘variable’. [less ▲]

Detailed reference viewed: 47 (1 UL)
See detailTransport inequalities for random point measures
Herry, Ronan; Gozlan, Nathael; Peccati, Giovanni UL

E-print/Working paper (2020)

Detailed reference viewed: 21 (1 UL)
See detailMedia use, attention, mental health and academic performance among 8 to 12 year old children
Cardoso-Leite, Pedro UL; Buchard, Albert; Tissieres, Isabel et al

E-print/Working paper (2020)

Detailed reference viewed: 25 (4 UL)
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See detailSupersingular Isogeny-Based Designated Verifier Blind Signature
Sahu, Rajeev Anand UL; Gini, Agnese UL; Pal, Ankan

E-print/Working paper (2019)

Detailed reference viewed: 42 (4 UL)
See detailCultivation and characterization of human midbrain organoids in sensor integrated microfluidic chips
Spitz, Sarah; Zanetti, Cristian; Bolognin, Silvia UL et al

E-print/Working paper (2019)

Detailed reference viewed: 61 (2 UL)
See detailFrom deformation theory of wheeled props to classification of Kontsevich formality maps
Andersson, Assar UL; Merkulov, Sergei UL

E-print/Working paper (2019)

We study homotopy theory of the wheeled prop controlling Poisson structures on arbitrary formal graded finite-dimensional manifolds and prove, in particular, that Grothendieck-Teichmueller group acts on ... [more ▼]

We study homotopy theory of the wheeled prop controlling Poisson structures on arbitrary formal graded finite-dimensional manifolds and prove, in particular, that Grothendieck-Teichmueller group acts on that wheeled prop faithfully and homotopy non-trivially. Next we apply this homotopy theory to the study of the deformation complex of an arbitrary Maxim Kontsevich formality map and compute the full cohomology group of that deformation complex in terms of the cohomology of a certain graph complex introduced earlier by Maxim Kontsevich in [K1] and studied by Thomas Willwacher in [W1]. [less ▲]

Detailed reference viewed: 72 (5 UL)
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Peer Reviewed
See detailProfit taxation and royalties: evidence from gold mines in Sub-Saharan Africa
Bertinelli, Luisito UL; Bourgain, Arnaud UL; Zanaj, Skerdilajda UL

E-print/Working paper (2019)

In this paper, we analyze theoretically and empirically the effects of tax changes on firms’ profits in extractive industries. In the theoretical part, we assume a country that levies a profit tax and a ... [more ▼]

In this paper, we analyze theoretically and empirically the effects of tax changes on firms’ profits in extractive industries. In the theoretical part, we assume a country that levies a profit tax and a royalty on the profits of extractive firms to maximize its tax revenues. The mining companies may reduce their taxable income by cost manipulation. By analyzing the optimal choice of the government and of the firms, we first establish the optimal tax policy and then we investigate the impact of the optimal fiscal policy on firms’ profits. In the empirical part of the paper, we estimate the effect of the profit tax and royalty on the extracting firms’ profit in African countries during the period spanning from 2007 to 2018. We use the Mining Intelligence database to constitute a panel of annual individual data from a database of 363 gold mines located in 21 Sub-Saharan countries. We obtain an inverse relationship between the tax rate change of the two tax instruments and the profit of the firms. [less ▲]

Detailed reference viewed: 44 (2 UL)
See detailA Directive to protect whistle-blowers
Kafteranis, Dimitrios UL

E-print/Working paper (2019)

Detailed reference viewed: 43 (2 UL)
See detailA note on a quantization via the Ran space
Kalugin, Alexey UL

E-print/Working paper (2019)

Detailed reference viewed: 21 (2 UL)
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Peer Reviewed
See detailParliamentary Administrations in EU Politics: The Sources and Impact of Diversity
Högenauer, Anna-Lena UL

E-print/Working paper (2019)

National parliaments tend to delegate a range of tasks related to EU affairs scrutiny to their administrations. However, there is considerable variation in the extent to which national parliaments invest ... [more ▼]

National parliaments tend to delegate a range of tasks related to EU affairs scrutiny to their administrations. However, there is considerable variation in the extent to which national parliaments invest in EU affairs staff. This raises two questions: what is the source of this diversity, and what is its impact on the EU affairs scrutiny of national parliaments? This paper argues that greater investments in EU affairs staff are associated with public Euroscepticism, large parliaments and parliaments with strong scrutiny powers. A large EU staff is, in turn, associated with parliaments that are relatively active in EU affairs scrutiny. This is particularly true for the 15 EU member states that joined before 2004. [less ▲]

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Peer Reviewed
See detailL'espace sportif européen: circulations, organisations et identité européenne
Moreau, Sebastien UL; Sbetti, Nicola; Dufraisse, Sylvain et al

E-print/Working paper (2019)

Dès la fin du xixe siècle, l’espace européen est le cadre d’un développement précoce des échanges sportifs et tient un rôle pionnier dans l’organisation internationale des sports. L’homogénéisation des ... [more ▼]

Dès la fin du xixe siècle, l’espace européen est le cadre d’un développement précoce des échanges sportifs et tient un rôle pionnier dans l’organisation internationale des sports. L’homogénéisation des pratiques et la mise en place de compétitions continentales, processus commencé dans l’entre-deux-guerres et qui se renforce après la Deuxième Guerre mondiale, a comme effet la constitution d’un espace sportif européen. Touchant autant les élites que les masses et le produit d’une intense médiatisation, les sports ont un impact qui dépasse largement les stades et permettent aux Européens de se rencontrer et in fine de mieux se connaître. [less ▲]

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Peer Reviewed
See detailThe 2019 European Parliament Elections in Luxembourg in the Context of Past Elections
Högenauer, Anna-Lena UL

E-print/Working paper (2019)

The aim of this article is to analyse the 2019 European election in Luxembourg and to contextualize it by comparing it with past elections. The article presents the party landscape, the electoral campaign ... [more ▼]

The aim of this article is to analyse the 2019 European election in Luxembourg and to contextualize it by comparing it with past elections. The article presents the party landscape, the electoral campaign, the electoral system and the results of the 2019 European election. The results are then analysed in the context of past national and European elections in order to establish whether European elections are second-order elections in Luxembourg, how electoral volatility evolved over time, whether there is a rise in Eurosceptic parties and how the representation of women has evolved since 1979. [less ▲]

Detailed reference viewed: 62 (2 UL)
See detailThe conformal group of a compact simply connected Lorentzian manifold
Melnick, Karin; Pecastaing, Vincent UL

E-print/Working paper (2019)

Detailed reference viewed: 117 (1 UL)
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See detailConstant Gaussian curvature foliations and Schläfli formulas of hyperbolic 3-manifolds
Mazzoli, Filippo UL

E-print/Working paper (2019)

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary ... [more ▼]

We study the geometry of the foliation by constant Gaussian curvature surfaces (S_k)_k of a hyperbolic end, and how it relates to the structures of its boundary at infinity and of its pleated boundary. First, we show that the Thurston and the Schwarzian parametrizations are the limits of two families of parametrizations of the space of hyperbolic ends, defined by Labourie in 1992 in terms of the geometry of the leaves S_k. We give a new description of the renormalized volume using the constant curvature foliation. We prove a generalization of McMullen's Kleinian reciprocity theorem, which replaces the role of the Schwarzian parametrization with Labourie's parametrizations. Finally, we describe the constant curvature foliation of a hyperbolic end as the integral curve of a time-dependent Hamiltonian vector field on the cotangent space to Teichmüller space, in analogy to the Moncrief flow for constant mean curvature foliations in Lorenzian space-times. [less ▲]

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See detailDeconstructing Blockchains: A Comprehensive Survey on Consensus, Membership and Structure
Natoli, Christopher; Yu, Jiangshan; Gramoli, Vincent et al

E-print/Working paper (2019)

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a ... [more ▼]

It is no exaggeration to say that since the introduction of Bitcoin, blockchains have become a disruptive technology that has shaken the world. However, the rising popularity of the paradigm has led to a flurry of proposals addressing variations and/or trying to solve problems stemming from the initial specification. This added considerable complexity to the current blockchain ecosystems, amplified by the absence of detail in many accompanying blockchain whitepapers. Through this paper, we set out to explain blockchains in a simple way, taming that complexity through the deconstruction of the blockchain into three simple, critical components common to all known systems: membership selection, consensus mechanism and structure. We propose an evaluation framework with insight into system models, desired properties and analysis criteria, using the decoupled components as criteria. We use this framework to provide clear and intuitive overviews of the design principles behind the analyzed systems and the properties achieved. We hope our effort will help clarifying the current state of blockchain proposals and provide directions to the analysis of future proposals. [less ▲]

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See detailProjective and conformal closed manifolds with a higher-rank lattice action
Pecastaing, Vincent UL

E-print/Working paper (2019)

We prove global results about actions of cocompact lattices in higher-rank simple Lie groups on closed manifolds endowed with either a projective class of connections or a conformal class of pseudo ... [more ▼]

We prove global results about actions of cocompact lattices in higher-rank simple Lie groups on closed manifolds endowed with either a projective class of connections or a conformal class of pseudo-Riemannian metrics of signature (p,q), with min(p,q)>1. In the continuity of a recent article, provided that such a structure is locally equivalent to its model X, the main question treated here is the completeness of the associated (G,X)-structure. The similarities between the model spaces of non-Lorentzian conformal geometry and projective geometry make that lots of arguments are valid for both cases, and we expose the proofs in parallel. The conclusion is that in both cases, when the real-rank is maximal, the manifold is globally equivalent to either the model space X or its double cover. [less ▲]

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See detailDer Arbeitsmarkt der Sozialen Arbeit 2018 = Le marché de l'emploi du secteur social en 2018
Flammang, Manou Laure UL; Böwen, Petra UL

E-print/Working paper (2019)

This newsletter describes the job market in the social work sector in Luxembourg in 2018. The data are derived from an ongoing research project by the "PraxisBüro" of the University of Luxembourg. The ... [more ▼]

This newsletter describes the job market in the social work sector in Luxembourg in 2018. The data are derived from an ongoing research project by the "PraxisBüro" of the University of Luxembourg. The newsletter presents a selection of statistics concerning for example the most sought after qualification levels, the distribution of practice fields, the distribution of job offers in public, municipal, private and non-governmental organisations and the documented gap between the demand of social workers with a Bachelor diploma and the number of Bachelor diplomas issued in Luxembourg. [less ▲]

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See detailAdvocate General Bobek on One of us – Legal Clarity vs Political Debate
Hiry, Jasmin UL

E-print/Working paper (2019)

Detailed reference viewed: 68 (1 UL)
Peer Reviewed
See detailAdvocate General Bobek on One of us – Legal Clarity vs Political Debate
Hiry, Jasmin UL

E-print/Working paper (2019)

Detailed reference viewed: 46 (2 UL)
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See detailLocal Social Interaction and Urban Equilibria
Picard, Pierre M UL; Augeraud-Veron, Emmanuelle; Maruhenda, Francisco

E-print/Working paper (2019)

In this paper we investigate the effect of local interaction in a simple urban economics model. Agents interact with others if and only if their interaction benefit outweights their travel cost and ... [more ▼]

In this paper we investigate the effect of local interaction in a simple urban economics model. Agents interact with others if and only if their interaction benefit outweights their travel cost and therefore meet others only within finite geographic windows. We show that two or more cites may co-exist at the equilibrium provided that they are sufficiently distant. For any interaction surplus function, there exists a unique spatial equilibrium on not too large city supports. The population density within a city is determined by a second order advance-delay differential equation, whose solutions are fully characterized for linear interaction surplus functions. Numerical analyses show that more localized interactions yield flatter population density and land rents over larger extents of the city support. They do not give support to the idea that multiple subcenters can be caused by small and finite geographic windows of interaction. [less ▲]

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See detailBorders and the mobility of migrants in France
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This country report investigates the ways in which the border as a site of control interferes with asylum seekers’ and refugees’ mobility trajectories before, upon and after arrival in France. The ... [more ▼]

This country report investigates the ways in which the border as a site of control interferes with asylum seekers’ and refugees’ mobility trajectories before, upon and after arrival in France. The interplay between borders and mobility plays a key role in the Common European Asylum System, the Schengen area and the Dublin regulation, which all have been affected by the 2015 so-called migration crisis. Based on in-depth qualitative interviews with thirteen migrants and ten institutional actors in the city of Metz, the overarching finding indicates that migrants’ movements evolve from geographical trajectories in order to reach a country of destination, to administrative trajectories, in order to become regularised in the host country. Furthermore, while physical borders have interfered with some informants’ migratory journeys, they have done so only by changing their trajectories, and, at times, the initial country of destination. Thus, they did not deter the migrants from reaching a safe country of destination. Once in Metz, the migrants become subject to administrative borders performed by state agents, such as the Préfecture and the French Agency for Immigration and Integration (OFII), as well as by private actors from the employment market. [less ▲]

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See detailBorders and the mobility of migrants in Luxembourg
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This country report sought to explore the border as a site of control and the ways in which it interferes with migrants’ (asylum seekers, refugees and rejected asylum seekers) trajectories before, upon ... [more ▼]

This country report sought to explore the border as a site of control and the ways in which it interferes with migrants’ (asylum seekers, refugees and rejected asylum seekers) trajectories before, upon and after arrival in Luxembourg. To this end, it explored, through qualitative interviews with a total of 29 state and civil society actors and migrants, as well as ethnographic observation at Findel airport, Luxembourg’s only external border, the multiple conceptualisations and experiences of borders. It has identified that the suppression of internal controls within the Schengen area has been accompanied by a surge of controls within the member states, either at the stage of lodging an asylum claim, or at the street level, where migrants can be stopped and searched by police officers. Furthermore, the data showed that the migrants interviewed not only did they experience bordering practices during their interactions with public actors, but they were also subject to bordering during their interactions with private actors from the housing and employment market. The principal finding of this research with regards to the interplay between borders and the mobility of migrants is that cross-border mobility is commonplace, the migrants’ mobility practices reflecting the movements of the local population. As such, borders do not represent efficient mechanisms of control which can prevent migrants’ mobility trajectories. [less ▲]

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See detailBorders and the mobility of migrants in the EU and Turkey
Paraschivescu, Claudia UL; Nienaber, Birte UL; Oesch, Lucas UL

E-print/Working paper (2019)

This comparative report investigates the ways in which the mobility of applicants for international protection, beneficiaries of international protection and irregular migrants intersect with the borders ... [more ▼]

This comparative report investigates the ways in which the mobility of applicants for international protection, beneficiaries of international protection and irregular migrants intersect with the borders encountered during their trajectories before, during and after their arrival in six EU countries (Greece, Hungary, Germany, Luxembourg, France and Spain) and Turkey. After defining the concept of borders, this study contextualises the securitisation of EU external and internal borders, and it provides some background information on the CEAS and the Dublin Regulation, which are central to this research. Moreover, it engages with the legislative framework in place in the field of asylum in the seven countries on which this report draws. Based on qualitative interviews with a total of 96 asylum seekers, refugees and irregular migrants, as well as 94 state and non-state actors and ethnographic observation, the empirical part of the study explored the following aspects: experiences and conceptualisations of borders; mobility patterns and trajectories; the interplay between the Schengen zone and the Dublin system; the shortcomings of CEAS; as well as policies and experiences in the fields of housing and employment. The main finding of this comparative report is that while territorial borders cannot always impede human mobility, they are recreated within countries as administrative borders, which can encourage secondary movements. [less ▲]

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See detailBelgien und Deutschland: eine kleine Beziehungsgeschichte
Brüll, Christoph UL

E-print/Working paper (2019)

Detailed reference viewed: 107 (5 UL)