Results 1 to 10 of about 77,425 (318)

Gödel metrics with chronology protection in Horndeski gravities

Physics Letters B, 2018
Gödel universe, one of the most interesting exact solutions predicted by General Relativity, describes a homogeneous rotating universe containing naked closed time-like curves (CTCs).
Wei-Jian Geng, Shou-Long Li, H. Lü, Hao Wei   +3 more
doaj   +3 more sources

Non-local curvature gravity cosmology via Noether symmetries

Physics Letters B, 2022
We consider extensions of General Relativity based on the non-local function f(R,□−1R), where R is the Ricci curvature scalar and the non-locality is due to the term □−1R.
Adriano Acunzo, Francesco Bajardi, Salvatore Capozziello   +2 more
doaj   +1 more source

Quadratic Theory of Gravity with a Scalar Field and Type I Shapovalov Wave Spacetimes

Universe, 2022
For the quadratic theory of gravity with a scalar field, exact solutions are found for gravitational-wave models in Shapovalov I-type spacetimes, which do not arise in models of the general theory of relativity.
Konstantin Osetrin, Ilya Kirnos, Altair Filippov   +2 more
doaj   +1 more source

Double copy of spontaneously broken Abelian gauge theory

Physics Letters B, 2022
Similarity in the structure of scattering amplitudes in Yang-Mills theories and General Relativity led to the idea that graviton could be described as the double copy of a vector gauge field.
Euro Spallucci, Anais Smailagic
doaj   +1 more source

Deforming black hole and cosmological solutions by quasiperiodic and/or pattern forming structures in modified and Einstein gravity

European Physical Journal C: Particles and Fields, 2018
We elaborate on the anholonomic frame deformation method, AFDM, for constructing exact solutions with quasiperiodic structure in modified gravity theories, MGTs, and general relativity, GR.
Laurenţiu Bubuianu, Sergiu I. Vacaru
doaj   +1 more source

Comparing mathematical modeling approaches for compact objects: vanishing complexity and embedding class one approaches in spherically symmetric systems with static background

European Physical Journal C: Particles and Fields, 2023
This study delves into the realm of solving Einstein’s field equations within the framework of general relativity. In this paper, we present an exact solution derived through the vanishing complexity approach and offer a comparative analysis with the ...
Satyanarayana Gedela, Ravindra K. Bisht
doaj   +1 more source

Isotropic Perfect Fluids in Modified Gravity

Universe, 2023
We generate the Einstein–Gauss–Bonnet field equations in higher dimensions for a spherically symmetric static spacetime. The matter distribution is a neutral fluid with isotropic pressure.
Shavani Naicker, Sunil D. Maharaj, Byron P. Brassel   +2 more
doaj   +1 more source

The Kerr-Schild double copy in Lifshitz spacetime

Journal of High Energy Physics, 2021
The Kerr-Schild double copy is a map between exact solutions of general relativity and Maxwell’s theory, where the nonlinear nature of general relativity is circumvented by considering solutions in the Kerr-Schild form.
Gökhan Alkaç, Mehmet Kemal Gümüş, Mustafa Tek   +2 more
doaj   +1 more source

S-duality and the double copy

Journal of High Energy Physics, 2020
The double copy formalism provides an intriguing connection between gauge theories and gravity. It was first demonstrated in the perturbative context of scattering amplitudes but recently the formalism has been applied to exact classical solutions in ...
Rashid Alawadhi, David S. Berman, Bill Spence, David Peinador Veiga   +3 more
doaj   +1 more source

An axially symmetric spacetime with causality violation in Ricci-inverse gravity

European Physical Journal C: Particles and Fields, 2023
In this paper, Ricci-inverse gravity is investigated. It is an alternative theory of gravity that introduces into the Einstein–Hilbert action an anti-curvature scalar that is obtained from the anti-curvature tensor which is the inverse of the Ricci ...
J. C. R. de Souza, A. F. Santos
doaj   +1 more source