Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Giardino, Serena"'
It is notoriously difficult to construct a stable non-singular bouncing cosmology that avoids all possible instabilities throughout the entire evolution of the universe. In this work, we explore whether a non-singular bounce driven by a specific clas
Externí odkaz:
http://arxiv.org/abs/2412.03977
Publikováno v:
Phys. Rev. D 109, no.12, 124033 (2024)
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 gr
Externí odkaz:
http://arxiv.org/abs/2401.10351
Autor:
Giardino, Serena, Giusti, Andrea
The first-order thermodynamics of scalar-tensor theory is a novel approach that exploits the intriguing relationship between gravity and thermodynamics to better understand the space of gravity theories. It is based on using Eckart's first-order irre
Externí odkaz:
http://arxiv.org/abs/2306.01580
Stealth solutions of scalar-tensor gravity and less-known de Sitter spaces that generalize them are analyzed regarding their possible role as thermal equilibria at non-zero temperature in the new first-order thermodynamics of scalar-tensor gravity. N
Externí odkaz:
http://arxiv.org/abs/2302.08550
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 gradients. The implications and subtleties arising in this situation are d
Externí odkaz:
http://arxiv.org/abs/2210.15348
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 potential. This provides a useful complementary picture for the first
Externí odkaz:
http://arxiv.org/abs/2208.04051
In the context of the recently proposed first-order thermodynamics of scalar-tensor gravity, we discuss the possibility of zero-temperature states of equilibrium other than Einstein gravity, including pathological Brans-Dicke theory, Palatini $f(R)$
Externí odkaz:
http://arxiv.org/abs/2206.02046
Publikováno v:
JCAP 04 (2022) 04, 053
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
Externí odkaz:
http://arxiv.org/abs/2202.07393
Autor:
Giardino, Serena, Salzano, Vincenzo
Publikováno v:
Eur. Phys. J. C 81, 110 (2021)
The Generalized Uncertainty Principle (GUP) has emerged in numerous attempts to a theory of quantum gravity and predicts the existence of a minimum length in Nature. In this work, we consider two cosmological models arising from Friedmann equations m
Externí odkaz:
http://arxiv.org/abs/2006.01580
Autor:
Faraoni, Valerio1 (AUTHOR) vfaraoni@ubishops.ca, Giardino, Serena2,3 (AUTHOR), Giusti, Andrea4 (AUTHOR), Vanderwee, Robert1 (AUTHOR)
Publikováno v:
European Physical Journal C -- Particles & Fields. Jan2023, Vol. 83 Issue 1, p1-11. 11p.
