| Online-Ressource |
Verfasst von: | Miranda, Marcello [VerfasserIn]  |
| Giardino, Serena [VerfasserIn]  |
| Giusti, Andrea [VerfasserIn]  |
| Heisenberg, Lavinia [VerfasserIn]  |
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 |
First-order thermodynamics of Horndeski cosmology / Miranda, Marcello [VerfasserIn]; 13 June, 2024 (Online-Ressource)