2008/01/31 by Alexander Branschädel, Thomas Gasenzer · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum, superfluid, helium dynamics #Strong Light-Matter Interactions #cond-mat.other #hep-ph
paper · pdf · doi:10.1088/0953-4075/41/13/135302
published as J.Phys.B41:135302,2008 · 24 pages, 7 figures. References added
arxiv created 2008/02/20 · openalex publication_date 2008/06/23 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
The far-from-equilibrium dynamics of an ultracold, one-dimensional Bose gas is studied. The focus is set on the comparison between the solutions of fully dynamical evolution equations derived from the two-particle irreducible (2PI) effective action and their corresponding kinetic approximation in the form of Boltzmann-type transport equations. It is shown that during the time evolution of the gas a kinetic description which includes non-Markovian memory effects in a gradient expansion becomes valid. The timescale at which this occurs is shown to exceed significantly the timescale at which the system's evolution enters a near-equilibrium drift period where a fluctuation–dissipation relation is found to hold and which would seem to be predestined for the kinetic approximation.