Coherent quasiparticle approximation cQPA and nonlocal coherence

Matti Herranen, Kimmo Kainulainen, Pyry M. Rahkila

Forskningsoutput: TidskriftsbidragKonferensartikelVetenskapligPeer review


We show that the dynamical Wigner functions for noninteracting fermions and bosons can have complex singularity structures with a number of new solutions accompanying the usual mass-shell dispersion relations. These new shell solutions are shown to encode the information of the quantum coherence between particles and antiparticles, left and right moving chiral states and/or between different flavour states. Analogously to the usual derivation of the Boltzmann equation, we impose this extended phase space structure on the full interacting theory. This extension of the quasiparticle approximation gives rise to a self-consistent equation of motion for a density matrix that combines the quantum mechanical coherence evolution with a well defined collision integral giving rise to decoherence. Several applications of the method are given, for example to the coherent particle production, electroweak baryogenesis and study of decoherence and thermalization.
TidskriftJournal of Physics : Conference Series
Sidor (från-till)012007
Antal sidor15
StatusPublicerad - 2010
MoE-publikationstypA4 Artikel i en konferenspublikation
EvenemangUnknown host publication - , Storbritannien
Varaktighet: 1 jan. 1800 → …

Bibliografisk information

An invited talk presented at the conference "Progress in
Nonequilibrium Greens Functions IV", University of Glasgow, August 17-21
2009. 15 pages 8 figures
Volume: 2010


  • 114 Fysik

Citera det här