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Expansion dynamics of a dipolar Bose-Einstein condensate

S. Giovanazzi 1, P. Pedri 2, L. M.N.B.F. Santos 3, A. Griesmaier 1, M. Fattori 1, T. Koch 1, J. Stuhler 1, T. Pfau 1 Physical Review A: Atomic, Molecular and Optical Physics 74 (2006) 013621 Our recent measurements on the expansion of a chromium dipolar condensate after release from an optical trapping potential are in good agreement with an exact solution of the hydrodynamic equations for dipolar Bose gases. We report […]

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Exact solution of a model of time-dependent evolutionary dynamics in a rugged fitness landscape

Satya N. Majumdar 2, David S. Dean 1 Journal of Statistical Mechanics: Theory and Experiment (2006) L07001 A simplified form of the quasispecies model of biological evolution is solved via a mapping onto a random flux model whose asymptotic behavior can be described in terms of a random walk. The statistics of the number of changes of the dominant species

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Exact asymptotic expansions for the cylindrical Poisson-Boltzmann equation

G. Tellez 1, E. Trizac 2, 3 Journal of Statistical Mechanics: Theory and Experiment 1 (2006) P06018 The mathematical theory of integrable Painleve/Toda type systems sheds new light on the behavior of solutions to the Poisson-Boltzmann equation for the potential due to a long rod-like macroion. We investigate here the case of symmetric electrolytes together with that of 1:2 and

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Energy fluctuations in vibrated and driven granular gases

P. Visco 1, 2, A. Puglisi 1, A. Barrat 1, F. van Wijland 1, 3, E. Trizac 2 European Physical Journal B 51 (2006) 377 We investigate the behavior of energy fluctuations in several models of granular gases maintained in a non-equilibrium steady state. In the case of a gas heated from a boundary, the inhomogeneities of the system play a predominant role. Interpreting the total kinetic

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Dynamics of a tracer granular particle as a non-equilibrium Markov process

Andrea Puglisi 1, Paolo Visco 1, 2, Emmanuel Trizac 2, Frederic van Wijland 1, 3 Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 73 (2006) 021301 The dynamics of a tracer particle in a stationary driven granular gas is investigated. We show how to transform the linear Boltzmann equation describing the dynamics of the tracer into a master equation for a continuous Markov process.

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Dynamics below the depinning threshold

Alejandro B. Kolton 1, Alberto Rosso 2, Thierry Giamarchi 1, Werner Krauth 3 Physical Review Letters 97 (2006) 057001 We study the steady-state low-temperature dynamics of an elastic line in a disordered medium below the depinning threshold. Analogously to the equilibrium dynamics, in the limit T->0, the steady state is dominated by a single configuration which is occupied with probability one. We develop

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Dimensional reduction on a sphere

Gunnar Moller 1, Sergey I. Matveenko 2, Stephane Ouvry 1 International Journal of Modern Physics B 20 (2006) 3533-3546 The question of the dimensional reduction of two-dimensional (2d) quantum models on a sphere to one-dimensional (1d) models on a circle is adressed. A possible application is to look at a relation between the 2d anyon model and the 1d Calogero-Sutherland model, which

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