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Second law of thermodynamics in nonminimally coupled gravity

Title
Second law of thermodynamics in nonminimally coupled gravity
Type
Article in International Scientific Journal
Year
2020
Authors
Azevedo, RPL
(Author)
Other
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Avelino, PP
(Author)
FCUP
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Journal
Title: Europhysics LettersImported from Authenticus Search for Journal Publications
Vol. 132
ISSN: 0295-5075
Other information
Authenticus ID: P-00T-AKT
Abstract (EN): In the present work we show that the second law of thermodynamics does not generally hold if the matter and gravitational fields are nonminimally coupled. We demonstrate this result by explicitly computing the evolution of the entropy of the matter fields in the case of a closed homogeneous and isotropic universe filled with dust and radiation, showing that, in this case, the sign of the entropy variation is determined by the evolution of the universe. The preservation of the second law of thermodynamics in these modified theories would require its generalization to account for a gravitational entropy contribution.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 7
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