Alternative formulations of the thermodynamics of scalar-tensor theories
We explore alternative formulations of the analogy between viable Horndeski gravity and Eckart's first-order thermodynamics. We single out a class of identifications for the effective stress-energy tensor of the scalar field fluid that, upon performing the imperfect fluid decomposition, yields constitutive relations that can be mapped onto Eckart's theory. We then investigate how different couplings to Einstein's gravity, at the level of the field equations, can affect the thermodynamic formalism overall. Last, we specialize the discussion to the case of ``traditional'' scalar-tensor theories and identify a specific choice of the coupling function that leads to a significant simplification of the formalism.
Authors
- Andrea Mentrelli (ORCID: https://orcid.org/0000-0002-8106-1096)
- Marcello Miranda (ORCID: https://orcid.org/0000-0003-0397-2705)
- Andrea Giusti (ORCID: https://orcid.org/0000-0003-0329-2726)
- Luca Gallerani
Institutions
- Istituto Nazionale di Fisica Nucleare (IT)
- University of Sussex (GB)
- Mater Research (AU)
- Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT)
- Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT)
- Scuola Superiore Meridionale (IT)
- University of Bologna (IT)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-09-27
- DOI
- https://doi.org/10.1103/physrevd.110.064087
- Citations
- 5
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 1.66
Funders
- Istituto Nazionale di Alta Matematica "Francesco Severi"
- Ministero dell'Università e della Ricerca
- Gruppo Nazionale per la Fisica Matematica
- Science and Technology Facilities Council
- Instituto Nazionale di Fisica Nucleare