Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-03-06
Phys.Rev.A76:033604,2007
Physics
Condensed Matter
Other Condensed Matter
19 pages, 10 figures
Scientific paper
10.1103/PhysRevA.76.033604
We investigate the conditions under which quantum fluctuations are relevant for the quantitative interpretation of experiments with ultracold Bose gases. This requires to go beyond the description in terms of the Gross-Pitaevskii and Hartree-Fock-Bogoliubov mean-field theories, which can be obtained as classical (statistical) field-theory approximations of the quantum many-body problem. We employ functional-integral techniques based on the two-particle irreducible (2PI) effective action. The role of quantum fluctuations is studied within the nonperturbative 2PI 1/N expansion to next-to-leading order. At this accuracy level memory-integrals enter the dynamic equations, which differ for quantum and classical statistical descriptions. This can be used to obtain a 'classicality' condition for the many-body dynamics. We exemplify this condition by studying the nonequilibrium evolution of a 1D Bose gas of sodium atoms, and discuss some distinctive properties of quantum versus classical statistical dynamics.
Berges Juergen
Gasenzer Thomas
No associations
LandOfFree
Quantum versus classical statistical dynamics of an ultracold Bose gas 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 Quantum versus classical statistical dynamics of an ultracold Bose gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum versus classical statistical dynamics of an ultracold Bose gas will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-234508