Unifying treatment of nonequilibrium and unstable dynamics of cold bosonic atom system with time-dependent order parameter in Thermo Field Dynamics

Y. Nakamura, Y. Yamanaka

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The coupled equations which describe the temporal evolution of the Bose-Einstein condensed system are derived in the framework of nonequilibrium Thermo Field Dynamics. The key element is that they are not the naive assemblages of assumed equations, but are the self-consistent ones derived by appropriate renormalization conditions. While the order parameter is time-dependent, an explicit quasiparticle picture is constructed by a time-dependent expansion. Our formulation is valid even for the system with a unstable condensate, and describes the condensate decay caused by the Landau instability as well as by the dynamical one.

Original languageEnglish
Pages (from-to)1070-1083
Number of pages14
JournalAnnals of Physics
Volume326
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

Keywords

  • Bose-Einstein condensation
  • Kinetic equation
  • Nonequilibrium
  • Thermal field theory
  • Transport equation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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