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Titolo:
Nonequilibrium time evolution of the spectral function in quantum field theory - art. no. 105010
Autore:
Aarts, G; Berges, J;
Indirizzi:
Inst Theoret Phys, D-69120 Heidelberg, Germany Inst Theoret Phys Heidelberg Germany D-69120 D-69120 Heidelberg, Germany
Titolo Testata:
PHYSICAL REVIEW D
fascicolo: 10, volume: 6410, anno: 2001,
pagine: 5010 -
SICI:
0556-2821(20011115)6410:10<5010:NTEOTS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSPORT-THEORY; SCALAR FIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Aarts, G Inst Theoret Phys, Philosophenweg 16, D-69120 Heidelberg, GermanyInst Theoret Phys Philosophenweg 16 Heidelberg Germany D-69120 y
Citazione:
G. Aarts e J. Berges, "Nonequilibrium time evolution of the spectral function in quantum field theory - art. no. 105010", PHYS REV D, 6410(10), 2001, pp. 5010

Abstract

Transport or kinetic equations are often derived assuming a quasiparticle (on-shell) representation of the spectral function. We investigate this assumption using a three-loop approximation of the 2PI effective action in real time, without a gradient expansion or on-shell approximation. For a scalar field in 1 + 1 dimensions the nonlinear evolution, including the integration over memory kernels, can be solved numerically. We find that a spectralfunction approximately described by a nonzero width emerges dynamically. During the nonequilibrium time evolution the Wigner transformed spectral function is slowly varying, even in the presence of strong qualitative changesin the effective particle distribution. These results may be used to make further analytical progress toward a quantum Boltzmann equation including off-shell effects and a nonzero width.

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Documento generato il 04/07/20 alle ore 11:37:29