490 citations
- Université de MontréalCA34 papers
- McGill UniversityCA24 papers
- Centre National de la Recherche ScientifiqueFR22 papers
- Champlain Regional CollegeCA18 papers
- Instituto de Astrofísica de CanariasES18 papers
- Massachusetts Institute of TechnologyUS18 papers
- Royal Military College of CanadaCA18 papers
- Ames Research CenterUS17 papers
- Universidad de La LagunaES17 papers
- Université Grenoble AlpesFR17 papers
- Center for Astrophysics Harvard & SmithsonianUS16 papers
- Institut de Planétologie et d'Astrophysique de GrenobleFR16 papers
14 papers · 2 filters
Past-directed scalar field gradients and scalar-tensor thermodynamics
Andrea Giusti, Serena Giardino, Valerio Faraoni
We refine and slightly enlarge the recently proposed first-order thermodynamics of scalar-tensor gravity to include gravitational scalar fields with timelike and past-directed grad…
Dominant Energy Condition and dissipative fluids in general relativity
Valerio Faraoni, El Mokhtar Z. R. Mokkedem
Existing literature implements the Dominant Energy Condition for dissipative fluids in general relativity. It is pointed out that this condition fails to forbid superluminal flows,…
Fluid nature constrains Horndeski gravity
Marcello Miranda, Daniele Vernieri, Salvatore Capozziello +1
The elusive physical nature of Horndeski gravity is elucidated in a new approach depicting this class of theories as a dissipative effective fluid. Requiring the constitutive equat…
New entropies, black holes, and holographic dark energy
Shin'ichi Nojiri, Sergei D. Odintsov, Valerio Faraoni
The Bekenstein-Hawking entropy is a cornerstone of horizon thermodynamics but quantum effects correct it, while inequivalent entropies arise also in non-extensive thermodynamics. R…
Scalar field as a perfect fluid: thermodynamics of minimally coupled scalars and Einstein frame scalar-tensor gravity
Valerio Faraoni, Serena Giardino, Andrea Giusti +1
We revisit the analogy between a minimally coupled scalar field in general relativity and a perfect fluid, correcting previous identifications of effective temperature and chemical…
Alternative entropies and consistent black hole thermodynamics
Shin'ichi Nojiri, Sergei D. Odintsov, Valerio Faraoni
While the Bekenstein-Hawking entropy is the unique notion of entropy that makes classical black hole thermodynamics consistent, alternative entropy notions (Rényi, Tsallis, and gen…