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Evolution of stellar entropy
Author(s) -
de Souza R.A.,
de Avellar M.G.B.,
Horvath J.E.
Publication year - 2015
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.201512234
Subject(s) - physics , baryon , entropy (arrow of time) , curvature , monotonic function , astrophysics , boltzmann's entropy formula , gravitational collapse , statistical physics , thermodynamics , mathematics , geometry , boltzmann equation , mathematical analysis
An appraisal of the behavior of stellar entropy along stellar evolution is made. It is shown that the entropy per baryon of a star of a fixed baryon number decreases monotonically with increasing compactness of the star. The same entropy per baryon increases only whenever an irreversible collapse of the star happens. The recent proposals for a gravitational entropy related to curvature may justify the huge increase of the entropy in the ultimate collapse to a black hole. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)