Zobrazeno 1 - 10
of 355
pro vyhledávání: '"De Felice, Antonio"'
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, Ozgur, De Felice, Antonio, Di Valentino, Eleonora, Kumar, Suresh, Nunes, Rafael C., Ozulker, Emre, Vazquez, J. Alberto, Yadav, Anita
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
Autor:
De Felice, Antonio, Tsujikawa, Shinji
Publikováno v:
Phys. Rev. D 109, 084022 (2024)
We compute the quasinormal modes of static and spherically symmetric black holes (BHs) with electric and magnetic charges. For the electrically charged case, the dynamics of perturbations separates into the odd- and even-parity sectors with two coupl
Externí odkaz:
http://arxiv.org/abs/2312.03191
Publikováno v:
JCAP04(2024)013
In this work, we derive for the first time observational constraints on the extended Minimal Theory of Massive Gravity (eMTMG) framework in light of Planck-CMB data, geometrical measurements from Baryon Acoustic Oscillation (BAO), Type Ia supernovae
Externí odkaz:
http://arxiv.org/abs/2311.10530