Ultracold atomic quantum gases far from equilibrium
T. Gasenzer, J. Berges, M.G. Schmidt, and M. Seco
TL;DR
This paper investigates the non-equilibrium dynamics of a one-dimensional ultracold Bose gas using a non-perturbative approach that captures effects beyond mean-field theory, providing insights into complex quantum many-body evolution.
Contribution
It introduces a systematic expansion of the two-particle irreducible effective action to study far-from-equilibrium dynamics in ultracold gases.
Findings
Captures scattering, memory, and off-shell effects
Provides dynamic equations beyond mean-field approximation
Enhances understanding of quantum thermalization processes
Abstract
We calculate the time evolution of a far-from-equilibrium initial state of a non-relativistic ultracold Bose gas in one spatial dimension. The non-perturbative approximation scheme is based on a systematic expansion of the two-particle irreducible effective action in powers of the inverse number of field components. This yields dynamic equations which contain direct scattering, memory and off-shell effects that are not captured in mean-field theory.
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