Results 1 to 10 of about 1,949 (157)

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

Bianchi type–I Model with Time Varying Λ and G: The Generalized Solution

Open Astronomy, 2020
In this paper, we have investigated the homogeneous and anisotropic Bianchi type–I cosmological model with a time-varying Newtonian and cosmological constant.
Aha Alfedeel
exaly   +2 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 ...
Ilya Shapiro, Grigori Chapiro
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

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

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

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, Nahid Fatima   +3 more
doaj   +1 more source

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

Homogeneous and anisotropic universe models with bouncing deceleration parameter in $f(R,T)$ theory

Journal of New Results in Science, 2023
In this study, we have investigated the cloud of string with perfect fluid (CSPF) matter distribution for the homogeneous and anisotropic (Bianchi I, III, and Kantowski-Sachs) universe models in the $f(R,T)$ theory.
Aysel Kızılcık, Can Aktaş
doaj   +1 more source