Zobrazeno 1 - 10
of 63
pro vyhledávání: '"Trombetta, Leonardo G."'
Publikováno v:
Phys. Rev. D 110, 064032 (2024)
Hairy black-holes are a unique prediction of certain theories that extend General Relativity (GR) with a scalar field. The presence of scalar hair is reflected non-trivially in the entropy of the black hole along with any topological coupling that ma
Externí odkaz:
http://arxiv.org/abs/2405.10127
Static black holes in general relativity modified by a linear scalar coupling to the Gauss-Bonnet invariant always carry hair. We show that the same mechanism that creates the hair makes it incompatible with a cosmological horizon. Other scalar-tenso
Externí odkaz:
http://arxiv.org/abs/2403.15537
Publikováno v:
JHEP 06 (2024) 117
We investigate how the speed of propagation of physical excitations is encoded in the coefficients of five-point interactions. This leads to a superluminality bound on scalar five-point interactions, which we present here for the first time. To subst
Externí odkaz:
http://arxiv.org/abs/2312.06759
Publikováno v:
Phys.Rev.D 108, 104019 (2023)
General Teleparallel theories assume that curvature is vanishing in which case gravity can be solely represented by torsion and/or nonmetricity. Using differential form language, we express the Riemannian Gauss-Bonnet invariant concisely in terms of
Externí odkaz:
http://arxiv.org/abs/2308.07299
Publikováno v:
Phys. Rev. D 107, 124038 (2023)
We consider the effect of stochastic fluctuations of the gravitational coupling G on the evolution of binary systems. We work at an elementary level, in the Newtonian limit, and focusing mainly on laser ranging. We show that, due to cumulative effect
Externí odkaz:
http://arxiv.org/abs/2304.01993
We study a stochastic version of the dynamical Casimir effect, computing the particle creation inside a cavity produced by a random motion of one of its walls. We first present a calculation perturbative in the amplitude of the motion. We compare the
Externí odkaz:
http://arxiv.org/abs/2212.13821
Publikováno v:
Phys. Rev. D 107 (2023), 104024
Horndeski gravity is the most general scalar-tensor theory with one scalar field leading to second-order Euler-Lagrange field equations for the metric and scalar field, and it is based on Riemannian geometry. In this paper, we formulate an analogue v
Externí odkaz:
http://arxiv.org/abs/2212.08005
We derive causality constraints on the simplest scalar-tensor theories in which black holes differ from what General Relativity predicts, a scalar coupled to the Gauss-Bonnet or the Chern-Simons terms. Demanding that time advances are unobservable wi
Externí odkaz:
http://arxiv.org/abs/2205.08551
Publikováno v:
JCAP 01 (2021) 045
Scalar-tensor theories are frequently only consistent with fifth force constraints in the presence of a screening mechanism, namely in order to suppress an otherwise unacceptably large coupling between the scalar and ordinary matter. Here we investig
Externí odkaz:
http://arxiv.org/abs/2008.08649
Autor:
Creminelli, Paolo, Loayza, Nicolás, Serra, Francesco, Trincherini, Enrico, Trombetta, Leonardo G.
Publikováno v:
JHEP 08 (2020) 045
Scalar hair of black holes in theories with a shift symmetry are constrained by the no-hair theorem of Hui and Nicolis, assuming spherical symmetry, time-independence of the scalar field and asymptotic flatness. The most studied counterexample is a l
Externí odkaz:
http://arxiv.org/abs/2004.02893