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First law of thermodynamics and entropy of FLRW universe in modified gravity

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arxiv 2307.04509 v1 pith:PUEJWN6R submitted 2023-07-10 gr-qc

Lorenzo Sebastiani This is my paper · ORCID
classification gr-qc
keywords entropyfirstflrwapparentgravityhorizonmodifiedtheories
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We investigate the first law of thermodynamics and entropy associated to the apparent horizon of (non-flat) FLRW space-time in different theories of modified gravity and in the presence of a perfect fluid of matter. We pose our attention on those theories which lead to second order differential field equations on FLRW background. In this way, we observe that one may obtain a formula for entropy in terms of the radius of the apparent horizon only. Thus, when considering a modification to the area law of General Relativity, it is possible to reconstruct the gravitational lagrangian consistent with the corresponding first law.

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  1. The generalized second law as a thermodynamic selection criterion for dynamical dark energy

    gr-qc 2026-08 conditional novelty 6.0 of 10

    The generalized second law imposes complementary bounds on the horizon entropy scaling k in phantom and quintessence regimes, selecting k=2 at a smooth phantom-divide crossing.

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