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Extended thermodynamics in the early Universe
Author(s) -
Lukács B.,
Martinás K.,
Pacher T.
Publication year - 1986
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113070306
Subject(s) - physics , thermalisation , formalism (music) , thermal equilibrium , universe , theoretical physics , statistical physics , thermodynamics , astrophysics , art , musical , visual arts
Abstract It is a general belief that in some early stages of the evolution of the Universe unequilibrium situations played important role. In order to incorporate some deviations from thermal equilibrium into the description of the evolution, here an extension of the thermodynamic formalism is given, where, using the notion of ekaentropy, new terms are introduced into the Gibbs‐Duhem relation for representing the deviation. Two situations are investigated in simplified models: the primordial thermalisation in the symmetric phase of GUT, and the development of a nonthermal distribution for massive neutrinos.