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Verfasst von:Miranda, Marcello [VerfasserIn]   i
 Giardino, Serena [VerfasserIn]   i
 Giusti, Andrea [VerfasserIn]   i
 Heisenberg, Lavinia [VerfasserIn]   i
Titel:First-order thermodynamics of Horndeski cosmology
Verf.angabe:Marcello Miranda, Serena Giardino, Andrea Giusti, and Lavinia Heisenberg
E-Jahr:2024
Jahr:13 June, 2024
Umfang:14 S.
Fussnoten:Gesehen am 25.11.2024
Titel Quelle:Enthalten in: Physical review
Ort Quelle:Ridge, NY : American Physical Society, 2016
Jahr Quelle:2024
Band/Heft Quelle:109(2024), 12, Artikel-ID 124033, Seite 1-14
ISSN Quelle:2470-0029
Abstract:We delve into the first-order thermodynamics of Horndeski gravity, focusing on spatially flat, homogeneous, and isotropic cosmologies. Our exploration begins with a comprehensive review of the effective fluid representation within viable Horndeski gravity. Notably, we uncover a surprising alignment between the constitutive relations governing the “Horndeski fluid” and those of Eckart’s thermodynamics. Narrowing our focus, we specialize our discussion to spatially flat Friedmann-Lemaître-Robertson-Walker spacetimes. Within this specific cosmological framework, we systematically analyze two classes of theories: shift symmetric and asymptotically shift symmetric. These theories are characterized by a nonvanishing braiding parameter, adding a nuanced dimension to our investigation. On the one hand, unlike the case of the “traditional” scalar-tensor gravity, these peculiar subclasses of viable Horndeski gravity never relax to General Relativity (seen within this formalism as an equilibrium state at zero temperature), but give rise to additional equilibrium states with nonvanishing viscosity. On the other hand, this analysis further confirms previous findings according to which curvature singularities are “hot” and exhibit a diverging temperature, which suggests that deviations of scalar-tensor theories from General Relativity become extreme at spacetime singularities. Furthermore, we provide a novel exact cosmological solution for an asymptotically shift-symmetric theory as a toy model for our thermodynamic analysis.
DOI:doi:10.1103/PhysRevD.109.124033
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: https://doi.org/10.1103/PhysRevD.109.124033
 Volltext: https://link.aps.org/doi/10.1103/PhysRevD.109.124033
 DOI: https://doi.org/10.1103/PhysRevD.109.124033
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1909441287
Verknüpfungen:→ Zeitschrift

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