Zobrazeno 1 - 10
of 347
pro vyhledávání: '"de Felice, Antonio"'
Autor:
De Felice, Antonio, Tsujikawa, Shinji
In general relativity with vector and scalar fields given by the Lagrangian ${\cal L}(F,\phi,X)$, where $F$ is a Maxwell term and $X$ is a kinetic term of the scalar field, we study the linear stability of static and spherically symmetric objects wit
Externí odkaz:
http://arxiv.org/abs/2412.04754
In a cosmological context, the Einstein-Gauss-Bonnet theory contains, in $d+4$ dimensions, a dynamical compactification scenario in which the additional dimensions settle down to a configuration with a constant radion/scale factor. Sadly however this
Externí odkaz:
http://arxiv.org/abs/2411.16983
While teleparallel $f(T)$ gravity has shown considerable potential in addressing cosmological tensions, such as the $H_0$ and $S_8$ discrepancies, we explore previously overlooked solution spaces within this framework that hold further promise. Speci
Externí odkaz:
http://arxiv.org/abs/2410.23068
Autor:
De Felice, Antonio, Tsujikawa, Shinji
We show that nonsingular black holes realized in nonlinear electrodynamics are always prone to Laplacian instability around the center because of a negative squared sound speed in the angular direction. This is the case for both electric and magnetic
Externí odkaz:
http://arxiv.org/abs/2410.00314
In a subclass of generalized Proca theories where a cubic vector Galileon term breaks the $U(1)$ gauge invariance, it is known that there are static and spherically symmetric black hole (BH) solutions endowed with nonvanishing temporal and longitudin
Externí odkaz:
http://arxiv.org/abs/2409.15606
In Einstein-Aether theories with a timelike unit vector field, we study the linear stability of static and spherically symmetric black holes against both even- and odd-parity perturbations. For this purpose, we formulate a gauge-invariant black hole
Externí odkaz:
http://arxiv.org/abs/2407.00287
Autor:
Akarsu, Özgür, De Felice, Antonio, Di Valentino, Eleonora, Kumar, Suresh, Nunes, Rafael C., Özülker, Emre, Vazquez, J. Alberto, Yadav, Anita
Publikováno v:
Phys. Rev. D 110, 103527 (2024)
The idea of a rapid sign-switching cosmological constant (mirror AdS-dS transition) in the late universe at $z\sim1.7$, known as the $\Lambda_{\rm s}$CDM model, has significantly improved the fit to observational data and provides a promising scenari
Externí odkaz:
http://arxiv.org/abs/2406.07526
Publikováno v:
JCAP 07 (2024) 022
Horndeski's vector-tensor (HVT) gravity is described by a Lagrangian in which the field strength $F_{\mu \nu}=\partial_{\mu} A_{\nu}-\partial_{\nu} A_{\mu}$ of a vector field $A_{\mu}$ interacts with a double dual Riemann tensor $L^{\mu \nu \alpha \b
Externí odkaz:
http://arxiv.org/abs/2404.09377
Autor:
De Felice, Antonio, Tsujikawa, Shinji
Publikováno v:
Phys. Lett. B 855 (2024) 138808
The axion-photon coupling allows the existence of a magnetically and electrically charged black hole (BH) solution endowed with a pseudo-scalar hair. For the Reissner-Nordstrom BH with a given total charge and mass, it is known that the quasinormal m
Externí odkaz:
http://arxiv.org/abs/2402.08868
Autor:
Akarsu, Ozgur, De Felice, Antonio, Di Valentino, Eleonora, Kumar, Suresh, Nunes, Rafael C., Ozulker, Emre, Vazquez, J. Alberto, Yadav, Anita
We have successfully integrated $\Lambda_{\rm s}$CDM, a promising model for alleviating cosmological tensions, into a theoretical framework by endowing it with a specific Lagrangian from the VCDM model, a type-II minimally modified gravity. In this t
Externí odkaz:
http://arxiv.org/abs/2402.07716