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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.
Norbert Van den Bergh, Van den Bergh, Norbert   +1 more
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Kerr–Newman-AdS black hole surrounded by perfect fluid matter in Rastall gravity

European Physical Journal C: Particles and Fields, 2018
The Rastall gravity is the modified Einstein general relativity, in which the energy-momentum conservation law is generalized to $$T^{\mu \nu }_{~~;\mu }=\lambda R^{,\nu }$$ T;μμν=λR,ν .
Zhaoyi Xu, Xian Hou, Xiaobo Gong, Jiancheng Wang   +3 more
doaj   +2 more sources

Gradient Ricci Bourguignon solitons on perfect fluid space-times [PDF]

Journal of Mahani Mathematical Research
The main purpose of the present paper is about characterizing the properties of the perfect fluid space-time that admits the gradient Ricci-Bourguignon soliton. This gives some results about the stability of the energy-momentum tensor and also under some
Sakineh Hajiaghasi, Shahroud Azami
doaj   +2 more sources

Perfect fluid dark matter

Physics Letters B, 2010
7 pages, 5 figures, To appear in Phys. Lett. B (2010)
Rahaman, F., Nandi, K.K., Bhadra, A., Kalam, M., Chakraborty, K.   +4 more
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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

Graphene: A Nearly Perfect Fluid [PDF]

Physical Review Letters, 2009
Hydrodynamics and collision-dominated transport are crucial to understand the slow dynamics of many correlated quantum liquids. The ratio eta/s of the shear viscosity eta to the entropy density s is uniquely suited to determine how strongly the excitations in a quantum fluid interact. We determine eta/s in clean undoped graphene using a quantum kinetic
Markus, Müller, Jörg, Schmalian, Lars, Fritz   +2 more
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Solution Generating with Perfect Fluids [PDF]

General Relativity and Gravitation, 1997
We apply a technique, due to Stephani, for generating solutions of the Einstein-perfect fluid equations. This technique is similar to the vacuum solution generating techniques of Ehlers, Harrison, Geroch and others. We start with a ``seed'' solution of the Einstein-perfect fluid equations with a Killing vector.
Garfinkle, David, Glass, E. N., Kirsch, J. P.   +2 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.
openaire   +3 more sources

Cosmological constant as Hyper Geometric function in fivedimensional space-time

Journal of Applied Science and Engineering, 2023
In this paper, we have studied the Einstein Field equation in Kaluza-Klein space-time in five dimension with the metric dS^2 = dt^2 − A^2(dx^2 + dy^2 + dz^2)− B^2dψ^2 under the assumption that B = αt, where α = Constant and scale factor satisfying the ...
Satish T. Rathod, Kalpana Pawar
doaj   +1 more source

Axistationary perfect fluids - a tetrad approach [PDF]

Classical and Quantum Gravity, 1999
12 ...
Fodor, Gyula, Marklund, Mattias, Perjés, Zoltán   +2 more
openaire   +2 more sources