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First-order thermodynamics of scalar-tensor cosmology

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arxiv 2202.07393 v1 pith:PFPAR2WG submitted 2022-02-15 gr-qc

Serena Giardino , Valerio Faraoni , Andrea Giusti This is my paper · ORCID
classification gr-qc
keywords effectivenearscalar-tensorsingularitiestemperaturethermodynamicsanalyticalapplied
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A new thermodynamics of scalar-tensor gravity is applied to spatially homogeneous and isotropic cosmologies in this class of theories and tested on analytical solutions. A forever-expanding universe approaches the Einstein "state of equilibrium" with zero effective temperature at late times and departs from it near spacetime singularities. "Cooling" by expansion and "heating" by singularities compete near the Big Rip, where it is found that the effective temperature diverges in the case of a conformally coupled scalar field.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Towards a causal effective thermodynamics of scalar-tensor gravity

    gr-qc 2026-05 unverdicted novelty 6.0 of 10

    Extends scalar-tensor gravity thermodynamics to causal Israel-Stewart model via timelike heat flux ansatz, decoupling T and K while preserving GR equilibrium.

  2. Black hole interiors in the thermal view of scalar-tensor gravity

    gr-qc 2025-05 conditional novelty 4.0 of 10

    In the thermal view of Brans-Dicke gravity, black hole singularities are 'hot': the effective temperature KT diverges as 1/t, and a fluid with P=wρ controls whether gravity approaches or departs from general relativity.

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