Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-07-20
Phys.Rev.A72:063604,2005
Physics
Condensed Matter
Other Condensed Matter
21 pages RevTeX, 12 figures
Scientific paper
10.1103/PhysRevA.72.063604
A dynamical many-body theory is presented which systematically extends beyond mean-field and perturbative quantum-field theoretical procedures. It allows us to study the dynamics of strongly interacting quantum-degenerate atomic gases. 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 by the Gross-Pitaevskii equation. This is relevant to account for the dynamics of, e.g., strongly interacting quantum gases atoms near a scattering resonance, or of one-dimensional Bose gases in the Tonks-Girardeau regime. We apply the theory to a homogeneous ultracold Bose gas in one spatial dimension. Considering the time evolution of an initial state far from equilibrium we show that it quickly evolves to a non-equilibrium quasistationary state and discuss the possibility to attribute an effective temperature to it. The approach to thermal equilibrium is found to be extremely slow.
Berges Juergen
Gasenzer Thomas
Schmidt Michael G.
Seco Marcos
No associations
LandOfFree
Nonperturbative dynamical many-body theory of a Bose-Einstein condensate does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nonperturbative dynamical many-body theory of a Bose-Einstein condensate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonperturbative dynamical many-body theory of a Bose-Einstein condensate will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-491102