Cosmological particle production and generalized thermodynamic equilibrium

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Cosmological particle production and generalized thermodynamic equilibrium

Winfried Zimdahl∗ Fakultät für Physik, Universität Konstanz, PF 5560 M678 D-78457 Konstanz, Germany Departament de F́ısica, Universitat Autònoma de Barcelona, E-08193 Bellaterra (Barcelona), Spain and Laboratoire de Gravitation et Cosmologie Relativistes, Université Pierre et Marie CurieCNRS/URA 769 Tour 22, 4ème étage, Bôıte 142, 4, place Jussieu, 75252 Paris Cedex 05, France (December 2, 1997)

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We show that the eeective coarse graining of a two-mode squeezed density matrix, implicit in the Wehrl approaches to a semiclassical phase-space distribution, leads to results in agreement with previous diierent deenitions of entropy for the process of pair production from the vacuum. We also present, in this context, a possible interpretation of the entropy growth as an ampliication (due to th...

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ژورنال

عنوان ژورنال: Physical Review D

سال: 1998

ISSN: 0556-2821,1089-4918

DOI: 10.1103/physrevd.57.2245