Results 1 to 10 of about 1,876 (158)

Symmetries of locally rotationally symmetric Bianchi type V spacetime

Results in Physics, 2023
In this paper, we classify the metric of locally rotationally symmetric Bianchi type V spacetime through its symmetries, including Killing, homothetic and conformal vector fields.
Jamshed Khan, Tahir Hussain, Nabil Mlaiki   +2 more
exaly   +3 more sources

Bianchi I metric solutions with nonminimally coupled Einstein–Maxwell gravity theory [PDF]

General Relativity and Gravitation, 2021
38 pages, 2 figures, 6 ...
Hossein Ghaffarnejad, Ghaffarnejad Hossein   +1 more
exaly   +3 more sources

Null energy condition violation and classical stability in the Bianchi I metric [PDF]

Physical Review D, 2009
The stability of isotropic cosmological solutions in the Bianchi I model is considered. We prove that the stability of isotropic solutions in the Bianchi I metric for a positive Hubble parameter follows from their stability in the Friedmann-Robertson-Walker metric. This result is applied to models inspired by string field theory, which violate the null
I Ya Aref'Eva, S Yu Vernov
exaly   +3 more sources

Cosmology of Bianchi type-I metric using renormalization group approach for quantum gravity [PDF]

Classical and Quantum Gravity, 2020
Abstract We study the anisotropic Bianchi type-I cosmological model at late times, taking into account quantum gravitational corrections in the formalism of the exact renormalization group flow of the effective average action for gravity.
Sunandan Gangopadhyay, Amitabha Lahiri
exaly   +4 more sources

Beyond the linear analysis of stability in higher derivative gravity with the Bianchi-I metric [PDF]

Physical Review D, 2019
11 pages, 11 ...
Grigori Chapiro, Ilya L Shapiro
exaly   +3 more sources

The Riemannian Bianchi Identities of Metric Connections with Skew Torsion and Generalized Ricci Solitons

Results in Mathematics
Curvature properties of a metric connection with totally skew-symmetric torsion are investigated. It is shown that if either the 3-form $T$ is harmonic, $dT=δT=0$ or the curvature of the torsion connection $R\in S^2Λ^2$ then the scalar curvature of a $\nabla$-Einstein manifold is determined by the norm of the torsion up to a constant. It is proved that
Ivanov S
exaly   +3 more sources

On the Completeness of Some Bianchi Type A and Related Kähler–Einstein Metrics [PDF]

The Journal of Geometric Analysis, 2021
minor ...
Maschler, Gideon, Ream, Robert
openaire   +3 more sources

Killing vector fields of locally rotationally symmetric Bianchi type V spacetime [PDF]

Scientific Reports
The classification of locally rotationally symmetric Bianchi type V spacetime based on its killing vector fields is presented in this paper using an algebraic method.
Shakeel Ahmad, Tahir Hussain, Abdul Baseer Saqib, Muhammad Farhan, Muhammad Farooq   +4 more
doaj   +2 more sources

Averaging generalized scalar field cosmologies I: locally rotationally symmetric Bianchi III and open Friedmann–Lemaître–Robertson–Walker models

European Physical Journal C: Particles and Fields, 2021
Scalar field cosmologies with a generalized harmonic potential and a matter fluid with a barotropic Equation of State (EoS) with barotropic index $$\gamma $$ γ for locally rotationally symmetric (LRS) Bianchi III metric and open Friedmann–Lemaître ...
Genly Leon, Esteban González, Samuel Lepe, Claudio Michea, Alfredo D. Millano   +4 more
doaj   +1 more source

Cosmological Solutions of Integrable F(R) Gravity Models with an Additional Scalar Field

Physical Sciences Forum, 2023
We consider F(R) cosmological models with a scalar field. For the R2 model in the spatially flat Friedmann–Lemaître–Robertson–Walker metric, the Ricci scalar R can smoothly change its sign during the evolution if and only if the scalar field is a phantom
Sergey Vernov, Vsevolod Ivanov
doaj   +1 more source