Zobrazeno 1 - 10
of 245
pro vyhledávání: '"Vásquez, Yerko"'
We consider a scalar field coupled to the torsion in Teleparallel Gravity with a coupling function that does not allow for a tachyonic instability to occur, and it leads to the formation of new black holes with scalar hair. The scalarized black hole
Externí odkaz:
http://arxiv.org/abs/2407.13557
We consider massive scalar field perturbations in the background of black holes immersed in Chaplygin-like dark fluid (CDF), and we analyze the photon sphere modes, the de Sitter modes as well as the near extremal modes and discuss their dominance, b
Externí odkaz:
http://arxiv.org/abs/2403.11306
Autor:
Alfaro, Sebastián, González, P. A., Olmos, Diego, Papantonopoulos, Eleftherios, Vásquez, Yerko
In this work we explore the propagation of massive scalar fields on some wormhole backgrounds. On one side, we consider the Bronnikov-Ellis wormhole solution and wormhole geometries with a non-constant redshift function by introducing a gravitational
Externí odkaz:
http://arxiv.org/abs/2402.15575
Autor:
Fritis, Alberto, Villalobos-Silva, Daniel, Vásquez, Yerko, López-Caraballo, Carlos H., Helo, Juan Carlos
We study the dynamics of homogeneous and isotropic Friedmann-Lema\^itre-Robertson-Walker cosmological models with positive spatial curvature within the context of mimetic gravity theory by employing dynamical system techniques. Our analysis yields ph
Externí odkaz:
http://arxiv.org/abs/2312.07765
We consider scalar field perturbations in the background of black holes immersed in perfect fluid dark matter (PFDM). We find, by using the sixth order Wentzel-Kramers-Brillouin (WKB) approximation, that the longest-lived modes are the ones with high
Externí odkaz:
http://arxiv.org/abs/2310.00857
In the context of the absolute parallelism formulation of General Relativity, and because of the fact that the scalar curvature can be written in purely torsional terms, it was known for a long time that a surface term based solely on the torsion ten
Externí odkaz:
http://arxiv.org/abs/2309.06293
The timelike structure of the five-dimensional Schwarzschild and Reissner-Nordstr\"om Anti-de Sitter black holes is studied in detail. Different kinds of motion are allowed and studied by using an adequate effective potential. Then, by solving the co
Externí odkaz:
http://arxiv.org/abs/2308.01498
In this work we consider the propagation of massive scalar fields in the background of Weyl black holes and we mainly study the effect of the scalar field mass in the spectrum of the quasinormal frequencies (QNFs) via the Wentzel-Kramers-Brillouin (W
Externí odkaz:
http://arxiv.org/abs/2304.00663
We consider the propagation of a charged massive scalar field in the background of a four-dimensional Ernst black hole and study its stability analyzing the quasinormal modes (QNMs), which are calculated using the semi-analytical Wentzel-Kramers-Bril
Externí odkaz:
http://arxiv.org/abs/2211.02931
In this work we consider a Generalized Bronnikov-Ellis wormhole and the tideless Morris-Thorne wormhole and we study the propagation of massive scalar fields. We calculate the quasinormal frequencies using the WKB method and the pseudospectal Chebysh
Externí odkaz:
http://arxiv.org/abs/2205.06079