2011

V. Garzo 1, E. Trizac 2 Europhysics Letters 94, 5 (2011) 50009 The dynamics of an impurity (or tracer particle) immersed in a dilute granular gas under uniform shear flow is investigated. A non-equilibrium phase transition is identified from an exact solution of the inelastic Boltzmann equation for a granular binary mixture in the tracer limit, where the impurity […]

Matthias Krüger 1, Thorsten Emig 2, Mehran Kardar 1 Physical Review Letters 106 (2011) 210404 The Casimir force between arbitrary objects in equilibrium is related to scattering from individual bodies. We extend this approach to heat transfer and Casimir forces in non-equilibrium cases where each body, and the environment, is at a different temperature. The formalism tracks the radiation from each

Matthias Krüger 1, Thorsten Emig 2, Giuseppe Bimonte 3, Mehran Kardar 1 Europhysics Letters 95, 2 (2011) 21002 We discuss non-equilibrium extensions of the Casimir force (due to electromagnetic fluctuations), where the objects as well as the environment are held at different temperatures. While the formalism we develop is quite general, we focus on a sphere in front of a plate, as well

Guillaume Roux 1, Evgeni Burovski 2, Thierry Jolicoeur 1 Physical Review A: Atomic, Molecular and Optical Physics 83 (2011) 053618 We consider two-component one-dimensional quantum gases at special imbalanced commensurabilities which lead to the formation of multimer (multi-particle bound-states) as the dominant order parameter. Luttinger liquid theory supports a mode-locking mechanism in which mass (or velocity) asymmetry is identified as the

Z. Burda 1, A. Krzywicki 2, O. C. Martin 3, 4, M. Zagorski 1 Proceedings of the National Academy of Sciences 108 (2011) 17263 Gene regulatory networks arise in all living cells, allowing the control of gene expression patterns. The study of their topology has revealed that certain subgraphs of interactions or ‘motifs’ appear at anomalously high frequencies. We ask here whether this phenomenon

Ginestra Bianconi 1, Davide Fichera 2, Silvio Franz 2, Luca Peliti 3 Journal of Statistical Mechanics: Theory and Experiment (2011) P08022 Several pathogens use evolvability as a survival strategy against acquired immunity of the host. Despite their high variability in time, some of them exhibit quite low variability within the population at any given time, a somehow paradoxical behavior often called the evolving

Arthur Lavarélo 1, Guillaume Roux 1, Nicolas Laflorencie 2 Physical Review B 84 (2011) 144407 The phase diagram of an antiferromagnetic ladder with frustrating next-nearest neighbor couplings along the legs is determined using numerical methods (exact diagonalization and density-matrix renormalization group) supplemented by strong-coupling and mean-field analysis. Interestingly, this model displays remarkable features, bridging the physics of the J_1-J_2 chain and

O. Melchert 1, A. K. Hartmann 1, M. Mezard 2 Physical Review E 84 (2011) 041106 We investigate both analytically and numerically the ensemble of minimum-weight loops and paths in the negative-weight percolation model on random graphs with fixed connectivity and bimodal weight distribution. This allows us to study the mean-field behavior of this model. The analytical study is based on

Tridib Sadhu 1, Satya N. Majumdar 2, David Mukamel 1 Physical Review E 84 (2011) 051136 We show that the presence of a localized drive in an otherwise diffusive system results in steady-state density and current profiles that decay algebraically to their global average value, away from the drive in two or higher dimensions. An analogy to an electrostatic problem is

Florian Angeletti 1, Marc Mézard 2, Eric Bertin 1, Patrice Abry 1 Physica D: Nonlinear Phenomena 240, 16 (2011) 1245-1253 The analysis of the linearization effect in multifractal analysis, and hence of the estimation of moments for multifractal processes, is revisited borrowing concepts from the statistical physics of disordered systems, notably from the analysis of the so-called Random Energy Model. Considering a standard