Quantum backreaction in dilute Bose-Einstein condensates
arXiv:cond-mat/0503581 · doi:10.1103/PhysRevD.72.105005
Abstract
For many physical systems which can be approximated by a classical background field plus small (linearized) quantum fluctuations, a fundamental question concerns the correct description of the backreaction of the quantum fluctuations onto the dynamics of the classical background. We investigate this problem for the example of dilute atomic/molecular Bose-Einstein condensates, for which the microscopic dynamical behavior is under control. It turns out that the effective-action technique does not yield the correct result in general and that the knowledge of the pseudo-energy-momentum tensor is not sufficient to describe quantum backreaction.
8 pages of RevTex4; extended discussion with additional sections, to be published in Physical Review D
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