Zobrazeno 1 - 10
of 1 514
pro vyhledávání: '"C, Fabris"'
Publikováno v:
Frontiers in Physics, Vol 12 (2024)
We briefly review the analytical continuation method for determining quasinormal modes (QNMs) and the associated frequencies in open systems. We explore two exactly solvable cases based on the Pöschl–Teller potential to show that the analytical co
Externí odkaz:
https://doaj.org/article/9f08d3e06bcd48a6be03191ad7ed48b4
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 5, Pp 1-11 (2024)
Abstract The structure of unimodular gravity (UG) is invariant to a subclass of diffeomorphism, the transverse diffeomorphism, due to the unimodular condition $$\sqrt{-g}=\epsilon $$ - g = ϵ . Consequently, there is a freedom to define how the conse
Externí odkaz:
https://doaj.org/article/66899722737242a5beafb40211e106dd
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 10, Pp 1-8 (2023)
Abstract In this article, the implementation of black-bounce solutions in f(R) theories is investigated. Black-bounce solutions are regular configurations of the static spherically symmetric space-time, containing both black holes and wormholes struc
Externí odkaz:
https://doaj.org/article/4750cc06191a460390a5af7ee43c195a
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 83, Iss 4, Pp 1-14 (2023)
Abstract In this work, we study the influence of f(R, T) gravity on rapidly rotating neutron stars. First we discuss the main aspects of this modified theory of gravity where the gravitational Lagrangian is an arbitrary function of the Ricci scalar R
Externí odkaz:
https://doaj.org/article/34ad2484533248c8ac9f923039613e54
Autor:
Neven Bilić, Júlio C. Fabris
Publikováno v:
Journal of High Energy Physics, Vol 2022, Iss 11, Pp 1-14 (2022)
Abstract A large AdS Schwarzschild black hole can be approximated by an AdS planar black hole. However, the temperature of a planar black hole is not well defined due to the translational invariance of the horizon. We propose to fix this arbitrarines
Externí odkaz:
https://doaj.org/article/65c63344f1a040e8aaba5ab0db670547
Publikováno v:
Universe, Vol 10, Iss 2, p 92 (2024)
After a century of cosmological observations, we have a solid standard model of cosmology. However, from a theoretical viewpoint, it is a compelling question if the cosmological data inevitably require an expanding universe independently of the theor
Externí odkaz:
https://doaj.org/article/2f47aeca970f46feadf6d1b2664967e0
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 6, Pp 1-9 (2022)
Abstract In this work we review the issue of imposing the conservation of the energy–momentum tensor as a necessary condition to recover the equivalence between the unimodular gravity and General Relativity (GR) equipped with a cosmological constan
Externí odkaz:
https://doaj.org/article/d6298c0a1c374d7aa5ae98ac5382a739
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 82, Iss 5, Pp 1-17 (2022)
Abstract This work is geared towards analysis of shadows cast by Kerr-de Sitter (KdS) and Kerr-de Sitter Revisited (RKdS) black holes. Considering observers in the vicinity of the static radius, we derive the impact parameters defining the apparent p
Externí odkaz:
https://doaj.org/article/30e619045cf2462bb4063a9b1634e077
Publikováno v:
Physics, Vol 3, Iss 4, Pp 1123-1132 (2021)
A Newtonian-like theory inspired by the Brans–Dicke gravitational Lagrangian has been recently proposed by us. For static configurations, the gravitational coupling acquires an intrinsic spatial dependence within the matter distribution. Therefore,
Externí odkaz:
https://doaj.org/article/13938fbac5a243d9aa7d76b820923593
Publikováno v:
Symmetry, Vol 15, Iss 7, p 1392 (2023)
Unimodular gravity is one of the oldest geometric gravity theories and alternatives to general relativity. Essentially, it is based on the Einstein–Hilbert Lagrangian with an additional constraint on the determinant of the metric. It can be explici
Externí odkaz:
https://doaj.org/article/ee702a1724cc41f6a7c9aee80c13eece