Results 1 to 10 of about 337 (135)

Static and stationary dark fluid universes: a gravitoelectromagnetic perspective [PDF]

Scientific Reports, 2022
The usual characterization of exact solutions of Einstein field equations, including cosmological solutions, is based on the symmetry properties of their corresponding metrics which is obviously mathematically involved.
M. Nouri-Zonoz, A. Nourizonoz
doaj   +2 more sources

Classification of LRS Bianchi-I spacetime in context of f(T) gravity via its self-similar symmetry. [PDF]

PLoS ONE
This study investigates self-similar vector fields of locally rotationally symmetric Bianchi type-I spacetimes within the framework of f(T) gravity, incorporating a perfect fluid as the matter source.
Rabeb Sidaoui, A H A Alfedeel, Jamshed Khan, Mohammed Alsharafi, E I Hassan, Khaled Aldwoah   +5 more
doaj   +2 more sources

Characterizations of generalized Robertson-Walker spacetimes concerning gradient solitons [PDF]

Heliyon
In this article, we examine gradient type Ricci solitons and (m,τ)-quasi Einstein solitons in generalized Robertson-Walker (GRW) spacetimes. Besides, we demonstrate that in this scenario the GRW spacetime presents the Robertson-Walker (RW) spacetime and ...
Krishnendu De, Mohammad Nazrul Islam Khan, Uday Chand De   +2 more
doaj   +2 more sources

Novel Theorems on Spacetime Admitting Pseudo-W2 Curvature Tensor

Journal of Mathematics
This paper investigates spacetime manifolds admitting a pseudo-W2 curvature tensor. We show that a pseudo-W2 flat spacetime is an Einstein manifold and therefore has constant curvature.
B. B. Chaturvedi, Prabhawati Bhagat, Mohammad Nazrul Islam Khan   +2 more
doaj   +2 more sources

Conharmonic Curvature Inheritance in Spacetime of General Relativity

Universe, 2021
The motive of the current article is to study and characterize the geometrical and physical competency of the conharmonic curvature inheritance (Conh CI) symmetry in spacetime.
Musavvir Ali, Mohammad Salman, Mohd Bilal   +2 more
doaj   +1 more source

Conformally Flat Pseudoprojective Symmetric Spacetimes in fR,G Gravity

Advances in Mathematical Physics, 2022
Sufficient conditions on a pseudoprojective symmetric spacetime  PPSn whose Ricci tensor is of Codazzi type to be either a perfect fluid or Einstein spacetime are given.
Uday Chand De, Sameh Shenawy, Abdallah Abdelhameed Syied, Nasser Bin Turki   +3 more
doaj   +1 more source

Hyper generalized pseudo Q -symmetric semi-Riemannian manifolds

Cubo, 2021
The object of the present paper is to study the properties of a hyper generalized pseudo Q-symmetric semi-Riemannian manifold, proving that under certain assumptions, it is a perfect fluid spacetime.
Adara M. Blaga, Manoj Ray Bakshi, Kanak Kanti Baishya   +2 more
doaj   +1 more source

Fluid dynamics in the warp drive spacetime geometry

European Physical Journal C: Particles and Fields, 2021
The Alcubierre warp drive metric is a spacetime geometry featuring a spacetime distortion, called a warp bubble, where a massive particle inside it acquires global superluminal velocities, or warp speeds.
Osvaldo L. Santos-Pereira, Everton M. C. Abreu, Marcelo B. Ribeiro   +2 more
doaj   +1 more source

Higher-Dimensional Regular Reissner–Nordström Black Holes Associated with Linear Electrodynamics

Universe, 2022
Following the interpretation of matter source that the energy-momentum tensor of anisotropic fluid can be dealt with effectively as the energy-momentum tensor of perfect fluid plus linear (Maxwell) electromagnetic field, we obtain the regular higher ...
Yu-Mei Wu, Yan-Gang Miao
doaj   +1 more source

A complete study of conformally flat pseudo-symmetric spacetimes in the theory of F ( R ) -gravity

Results in Physics, 2022
The motive in this article is twofold. First we investigate the geometrical structures of a pseudo-symmetric spacetime ( P S ) 4 with a timelike vector under the condition of conformal flatness.
Avik De, Simran Arora, Uday Chand De, P.K. Sahoo   +3 more
doaj   +1 more source