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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.<\/jats:p>","DOI":"10.1209\/0295-5075\/132\/30005","type":"journal-article","created":{"date-parts":[[2020,12,30]],"date-time":"2020-12-30T23:29:55Z","timestamp":1609370995000},"page":"30005","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Second law of thermodynamics in nonminimally coupled gravity"],"prefix":"10.1209","volume":"132","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9468-3281","authenticated-orcid":false,"given":"R. P. 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