Results 11 to 20 of about 18,336 (194)
Perfect fluid with shear viscosity and spacetime evolution
Chinese Journal of PhysicsWe investigate the anisotropic evolution of spacetime driven by perfect fluid with off-diagonal shear-viscosity components. We consider the simplest form of the equation of state for fluid, for which the pressure and the shear stress are proportional to the energy density individually.
Inyong Cho, Rajibul Shaikh
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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 +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.
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Perfect fluid spacetimes and $k$-almost Yamabe solitons
Turkish Journal of Mathematics, 2023 In this article, we presumed that a perfect fluid is the source of the gravitational field while analyzing the solutions to the Einstein field equations. With this new and creative approach, here we study $k$-almost yamabe solitons and gradient $k$-almost yamabe solitons.
De, Krishnendu +2 more
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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 +2 more
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Homothetic perfect fluid spacetimes [PDF]
Classical and Quantum Gravity, 1997 A brief summary of results on homotheties in General Relativity is given, including general information about space-times admitting an r-parameter group of homothetic transformations for r>2, as well as some specific results on perfect fluids. Attention is then focussed on inhomogeneous models, in particular on those with a homothetic group $H_4 ...
Carot, J., Sintes, A. M.
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Isotropic Cosmological Singularities: I. Polytropic Perfect Fluid Spacetimes [PDF]
Annals of Physics, 1999 The conformal Einstein equations for polytropic perfect fluids cosmologies which admit an isotropic singularity are considered. It is proved that the Cauchy problem in this case is well posed, that is, that solution exist, are unique an depend smoothly on the initial data of the 3- surface of the singularity.
Anguige, K., Tod, K. P.
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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.
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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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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
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