Results 21 to 30 of about 166,028,825 (289)
Modified theories of gravity: Why, how and what?
General Relativity and Gravitation, 2022 44 pages, 4 figures; Review article accepted in the special issue of General Relativity and Gravitation, dedicated to the memory of Professor Thanu ...
S. Shankaranarayanan, Joseph P. Johnson
openaire +2 more sources
PhD thesis : Compact objects in modified theories of gravity [PDF]
, 2022 The formulation of General Relativity by Albert Einstein in 1915 revolutionised our understanding of the gravitational interaction. However, despite its tremendous successes, this theory struggle to explain certain important phenomena such as the ...
Ducobu, Ludovic
core +1 more source
Living Reviews in Relativity, 2014 We review recent progress in massive gravity. We start by showing how different theories of massive gravity emerge from a higher-dimensional theory of general relativity, leading to the Dvali–Gabadadze–Porrati model (DGP), cascading gravity, and ghost ...
Claudia de Rham
doaj +1 more source
Exact rotating black hole solutions for f(R) gravity by modified Newman Janis algorithm
European Physical Journal C: Particles and Fields, 2023 We show that the f(R)-gravity theories with constant Ricci scalar in the Jordan/Einstein frame can be described by Einstein or Einstein–Maxwell gravity with a cosmological term and a modified gravitational constant.
Pankaj Chaturvedi +3 more
doaj +1 more source
Cosmological behavior of Bekenstein’s modified theory of gravity [PDF]
Physical Review D, 2007 We study the background cosmology governed by the Tensor-Vector-Scalar theory of gravity proposed by Bekenstein. We consider a broad family of potentials that lead to modified gravity and calculate the evolution of the field variables both numerically and analytically.
Bourliot, F +3 more
openaire +3 more sources
Disformal transformation of cosmological perturbations
Physics Letters B, 2014 We investigate the gauge-invariant cosmological perturbations in the gravity and matter frames in the general scalar–tensor theory where two frames are related by the disformal transformation.
Masato Minamitsuji
doaj +1 more source
The validity of Birkhoff’s theorem in modified teleparallel equivalent theories of gravity
European Physical Journal C: Particles and Fields, 2023 Birkhoff’s theorem is a vitally important theorem in studying local systems in theories of gravity. In this paper we provide a straightforward proof of the validity of Birkhoff’s theorem in modified teleparallel equivalent theories of gravity, which ...
Ji-Yu Cheng
doaj +1 more source
Gravitomagnetism in modified theory of gravity [PDF]
International Journal of Modern Physics D, 2019 We study the gravitomagnetism in the Scalar-Vector-Tensor theory or Moffat’s Modified theory of Gravity (MOG). We compute the gravitomagnetic field that a slow-moving mass distribution produces in its Newtonian regime. We report that the consistency between the MOG gravitomagnetic field and that predicted by the Einstein’s gravitational theory and ...
openaire +4 more sources
General Relativity solutions in modified gravity
Physics Letters B, 2018 Recent gravitational wave observations of binary black hole mergers and a binary neutron star merger by LIGO and Virgo Collaborations associated with its optical counterpart constrain deviation from General Relativity (GR) both on strong-field regime and
Hayato Motohashi, Masato Minamitsuji
doaj +1 more source
Probing the existence of the ZTF Casimir wormholes in the framework of f(R) gravity
Nuclear Physics B, 2022 For the spherically symmetric static traversable wormholes, supported by the Casimir energy in f(R)=R+αR2 Quadratic, f(R)=f0Rn power-law Modified Gravity (MOG) theories we investigate energy conditions and dynamical stability of the wormhole solutions ...
Oleksii Sokoliuk +2 more
doaj +1 more source