Infinite Kinematic Self-Similarity and Perfect Fluid Spacetimes [PDF]
General Relativity and Gravitation, 2001 38 pages, 6 figures.
Sintes, A., Benoit, P., Coley, A.
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Perfect Fluid Spacetimes and Gradient Solitons
Journal of Nonlinear Mathematical Physics, 2022 AbstractIn this article, we investigate perfect fluid spacetimes equipped with concircular vector field. At first, in a perfect fluid spacetime admitting concircular vector field, we prove that the velocity vector field annihilates the conformal curvature tensor.
Krishnendu De +4 more
exaly +7 more sources
Conformal Einstein Perfect Fluid Spacetimes [PDF]
Journal of Physics: Conference Series, 2011 A review is given of results obtained in connection with perfect fluid spacetimes which are conformally related to Einstein spaces.
Van den Bergh, Norbert
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Collapsing perfect fluid in higher-dimensional spherical spacetimes [PDF]
Classical and Quantum Gravity, 2000 Class. Quantum Grav.
Villas da Rocha, Jaime F., Wang, Anzhong
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Characterizations of generalized Robertson-Walker spacetimes concerning gradient solitons [PDF]
HeliyonIn 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 +2 more
doaj +2 more sources
Classification of LRS Bianchi-I spacetime in context of f(T) gravity via its self-similar symmetry. [PDF]
PLoS ONEThis 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 +5 more
doaj +2 more sources
Cosmological reconstruction and energy constraints in generalized Gauss–Bonnet-scalar–kinetic–matter couplings [PDF]
Scientific Reports, 2020 Recently introduced $$f(\mathcal {G},T)$$ f ( G , T ) theory is generalized by adding dependence on the arbitrary scalar field $$\phi $$ ϕ and its kinetic term $$(\nabla \phi )^2$$ ( ∇ ϕ ) 2 , to explore non-minimal interactions between geometry, scalar ...
Adam Z. Kaczmarek, Dominik Szczęśniak
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The Initial Singularity of Ultrastiff Perfect Fluid Spacetimes Without Symmetries [PDF]
Communications in Mathematical Physics, 2012 We consider the Einstein equations coupled to an ultrastiff perfect fluid and prove the existence of a family of solutions with an initial singularity whose structure is that of explicit isotropic models. This family of solutions is `generic' in the sense that it depends on as many free functions as a general solution, i.e., without imposing any ...
Heinzle, Johannes Markus, Sandin, Patrik
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Spacetimes Admitting Concircular Curvature Tensor in f(R) Gravity
Frontiers in Physics, 2022 The main object of this paper is to investigate spacetimes admitting concircular curvature tensor in f(R) gravity theory. At first, concircularly flat and concircularly flat perfect fluid spacetimes in fR gravity are studied.
Uday Chand De +5 more
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Perfect fluid spacetimes with two symmetries [PDF]
Classical and Quantum Gravity, 2004 A method of solving perfect fluid Einstein equations with two commuting spacelike Killing vectors is presented. Given a spacelike 2-dimensional surface in the 3-dimensional nonphysical Minkowski space the field equations reduce to a single nonlinear differential equation. An example is discussed.
Szereszewski, A., Tafel, J.
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