Evolution of stellar entropy | Zendy

de Souza R.A. | Zendy; de Avellar M.G.B. | Zendy; Horvath J.E. | Zendy

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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)

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