laboratoire de physique statistique
 
 
laboratoire de physique statistique

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PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 


9
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2015
Large deviations, metastability and selection - Kurchan, Jorge
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 418170-188 (2015)

Abstract : In this note I introduce some techniques to treat systems in contact with (stochastic) thermal baths. The methods and the level of rigour are those of theoretical physics. (C) 2014 Elsevier B.V. All rights reserved.
 
2014
Quantum walks in artificial electric and gravitational fields - Di Molfetta, Giuseppe and Brachet, Marc and Debbasch, Fabrice
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 397157-168 (2014)

Abstract : The continuous limit of quantum walks (QWs) on the line is revisited through a new, recently developed method. In all cases but one, the limit coincides with the dynamics of a Dirac fermion coupled to an artificial electric and/or relativistic gravitational field. All results are carefully discussed and illustrated by numerical simulations. Possible experimental realizations are also addressed. (C) 2013 Elsevier B.V. All rights reserved.
 
2011
Low-energy modes and Debye behavior in a colloidal crystal - Ghosh, Antina and Mari, Romain and Chikkadi, V. K. and Schall, Peter and Maggs, A. C. and Bonn, Daniel
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 3903061-3068 (2011)

Abstract : We study the vibrational spectrum and the low-energy modes of a three-dimensional colloidal crystal using confocal microscopy. This is done in a two-dimensional cut through a three-dimensional crystal. We find that the observed density of states is incompatible with the standard Debye form in either two or three dimensions. These results are confirmed by numerical simulations. We show that an effective theory for the projections of the modes onto the two-dimensional cut describes the experimental and simulation data in a satisfactory way. (C) 2011 Elsevier B.V. All rights reserved.
 
2008
The labour market on the hypercube - Araujo, Tanya and Weisbuch, Gerard
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 3871301-1310 (2008)

Abstract : Positions offered on a labour market and workers preferences are described here by bit strings representing individual traits. We study the co-evolution of workers and firms preferences modeled by such traits. Individual ``size-like'' properties are controlled by binary encounters whose outcomes depend upon a recognition process. Depending upon the parameter set-up, mutual selection of workers and positions results in different types of attractors, either an exclusive niches regime or a competition regime. (c) 2007 Elsevier B.V. All rights reserved.
Collective states in social systems with interacting learning agents - Semeshenko, Viktoriya and Gordon, Mirta B. and Nadal, Jean-Pierre
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 3874903-4916 (2008)

Abstract : We study the implications of social interactions and individual learning features on consumer demand in a simple market model. We consider a social system of interacting heterogeneous agents with learning abilities. Given a fixed price, agents repeatedly decide whether or not to buy a unit of a good, so as to maximize their expected utilities. This model is close to Random Field Ising Models, where the random field corresponds to the idiosyncratic willingness to pay. We show that the equilibrium reached depends on the nature of the information agents use to estimate their expected utilities. It may be different from the systems' Nash equilibria. (C) 2008 Elsevier B.V. All rights reserved.
Simple models of firms emergence - Weisbuch, Gerard and Mangalagiu, Diana and Ben-Av, Radel and Solomon, Sorin
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 3875231-5238 (2008)

Abstract : We present a dynamical model of the emergence of firms as opposed to a flat about market where entrepreneurs would recruit workers for each business opportunity. The model uses a preferential choice of partners based on previous collaborations experience. A sharp transition in the parameter space separates an ordered regime, where preferential links establish, from a disordered regime corresponding to a fast turnover of employees. (C) 2008 Elsevier B.V. All rights reserved.
 
2007
Thermal statistical ensembles of black holes - Chevalier, C. and Bustamante, M. and Debbasch, F.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 376293-307 (2007)

Abstract : We consider statistical ensembles of Schwarzschild black holes and prove that these ensembles describe black holes of nonvanishing temperatures. The mean space-times associated to these ensembles are explored through exact computations of their energy distributions, total masses and calorific capacities. We discuss our results, with special emphasis on their connections with current and near future observations of astrophysical black holes, string theory and cosmology. (c) 2006 Elsevier B.V. All rights reserved.
``Antiferromagnetism'' in social relations and Bonabeau model - Weisbuch, Gerard and Stauffer, Dietrich
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 384542-548 (2007)

Abstract : We here present a fixed agents version of an original model of the emergence of hierarchies among social agents first introduced by Bonabeau et al. Having interactions occurring on a social network rather than among ``walkers'' does not drastically alter the dynamics. But it makes social structures more stable and give a clearer picture of the social organisation in a ``mixed'' regime, where finite ordered domains appear. (C) 2007 Elsevier B.V. All rights reserved.
Repulsive and attractive critical Casimir forces - Rafai, Salima and Bonn, Daniel and Meunier, Jacques
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS 38631-35 (2007)

Abstract : When confining vacuum fluctuations between two identical walls, the Casimir force manifests itself as a mutual attraction of the walls. When confining concentration fluctuations of a binary liquid mixture, an analogous force should exist near the critical temperature T-C; it is called the critical Casimir force. Here we show experimentally that this purely entropic force can be either attractive or repulsive, depending on the boundary conditions for the fluctuations. For symmetrical boundary conditions an attractive force is found while asymmetrical ones lead to a repulsive force. This is observed directly by confining the fluctuations in a thin (approximate to 100 angstrom) wetting film. Depending on the boundary conditions either a thinning or a thickening of the film is observed when T -> Tc. (c) 2007 Elsevier B.V. All rights reserved.