Zobrazeno 1 - 10
of 359
pro vyhledávání: '"Papantonopoulos, Eleftherios"'
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
Publikováno v:
Physical Review D 110, L061503 (2024)
We find that a \textit{slowly} rotating axion-modified black hole resulting from the backreaction of an axion field on a rotating Kerr black hole can have a \textit{D-shaped} shadow as that for a \textit{highly} counter-rotating Kerr black hole. This
Externí odkaz:
http://arxiv.org/abs/2406.11932
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:
Bakopoulos, Athanasios, Karakasis, Thanasis, Mavromatos, Nick E., Nakas, Theodoros, Papantonopoulos, Eleftherios
Publikováno v:
Phys.Rev.D 110 (2024) 2, 024014
We consider higher-order derivative gauge field corrections that arise in the fundamental context of dimensional reduction of String Theory and Lovelock-inspired gravities and obtain an exact and asymptotically flat black-hole solution, in the presen
Externí odkaz:
http://arxiv.org/abs/2402.12459
Publikováno v:
Phys. Rev. D 109, 024033 (2024)
We discuss spontaneous scalarization of the Reissner-Nordstr\"om black hole in the presence of higher derivative gauge field corrections that arise in the context of string, as well as higher-dimensional more fundamental gravity theories. Our theory
Externí odkaz:
http://arxiv.org/abs/2311.10858
Autor:
Theodosopoulos, Dionysios P., Karakasis, Thanasis, Koutsoumbas, George, Papantonopoulos, Eleftherios
We study the motion of uncharged particles and photons in the background of a magnetically charged Euler-Heisenberg (EH) black hole (BH) with scalar hair. The spacetime can be asymptotically (A)dS or flat. After investigating particle motions around
Externí odkaz:
http://arxiv.org/abs/2311.02740
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
We explore the consistent truncation of conserved charges in Quadratic Curvature Gravity (QCG) with anti-de Sitter asymptotics to the linear order in the Weyl tensor. The QCG action is given by the most general curvature-squared corrections to Einste
Externí odkaz:
http://arxiv.org/abs/2307.00554
In this work we are revisiting the well studied Ellis wormhole solution in a generalized Horndeski theory motivated from the Kaluza-Klein compactification procedure of the more fundamental higher dimensional Lovelock gravity. We show that the Ellis w
Externí odkaz:
http://arxiv.org/abs/2306.16768