2005/03/31 by Ralf Schützhold, Michael Uhlmann, Yan Xu +1 · 3 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Quantum Electrodynamics and Casimir Effect #Quantum, superfluid, helium dynamics #cond-mat.other #gr-qc #hep-th #quant-ph
paper · pdf · doi:10.1103/physrevd.72.105005
published as Phys.Rev.D72:105005,2005 · 8 pages of RevTex4; extended discussion with additional sections, to be published in Physical Review D
arxiv created 2005/11/03 · openalex publication_date 2005/11/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 ⟨\stackrel^T_\ensuremathμ\ensuremathν⟩ is not sufficient to describe quantum backreaction.