Perfect Fluid Spacetimes Admitting Almost Riemann Solitons
AxiomsIn this investigation, we examine the geometric character of almost Riemann solitons and gradient almost Riemann solitons in the context of perfect fluid solutions of the Einstein equations that admit a torse-forming vector field ζ.
Mehdi Jafari, Shahroud Azami
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Gravitational field of a spherical perfect fluid
European Physical Journal C: Particles and Fields, 2019 Analyzing the spacetime for a static spherically distributed perfect fluid we show that the smooth matching of the interior and exterior metrics for a realistic source is possible only for the distances from the origin that exceeds the photon sphere ...
Merab Gogberashvili, Beka Modrekiladze
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Geometric Classifications of Perfect Fluid Space-Time Admit Conformal Ricci-Bourguignon Solitons
Journal of MathematicsThis paper is dedicated to the study of the geometric composition of a perfect fluid space-time with a conformal Ricci-Bourguignon soliton, which is the extended version of the soliton to the Ricci-Bourguignon flow.
Noura Alhouiti +5 more
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Sufficient conditions for a pseudosymmetric spacetime to be a perfect fluid spacetime [PDF]
, 2021 The aim of the present paper is to obtain the condition under which a pseudosymmetric spacetime to be a perfect fluid spacetime. It is proven that a pseudosymmetric generalized Robertson-Walker spacetime is a perfect fluid spacetime.
De, Krishnendu +3 more
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Perfect fluid with shear viscosity and spacetime evolution [PDF]
, 2023 We 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 ...
Cho, Inyong, Shaikh, Rajibul
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On a perfect fluid Kahler spacetime [PDF]
, 2016 The object of the present paper is to study a perfect fluid K¨ahlerspacetime. A perfect fluid K¨ahler spacetime satisfying the Einstein field equation with a cosmological term has been studied and the existence of killingand conformal killing vectors ...
PANDEY, P. N., SRIVASTAVA, VIBHA
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Geometrical Structure in a Perfect Fluid Spacetime with Conformal Ricci–Yamabe Soliton
, 2022 The present paper aims to deliberate the geometric composition of a perfect fluid spacetime with torse-forming vector field ξ in connection with conformal Ricci–Yamabe metric and conformal η-Ricci–Yamabe metric.
Soumendu Roy +4 more
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Points in general relativistic shock wave interaction are “regularity singularities” where spacetime is not locally flat [PDF]
, 2011 We show that the regularity of the gravitational metric tensor in spher- ically symmetric spacetimes cannot be lifted from C0,1 to C1,1 within the class of C1,1 coordinate transformations in a neighborhood of a point of shock wave inter- action in ...
Reintjes, Moritz, Temple, Blake
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A Possible Explanation of Dark Matter and Dark Energy Involving a Vector Torsion Field
Universe, 2022 A simple gravitational model with torsion is studied, and it is suggested that it could explain the dark matter and dark energy in the universe. It can be reinterpreted as a model using the Einstein gravitational equations where spacetime has regions ...
Graeme W. Milton
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Stability of generic thin shells in conformally flat spacetimes
European Physical Journal C: Particles and Fields, 2017 Some important spacetimes are conformally flat; examples are the Robertson–Walker cosmological metric, the Einstein–de Sitter spacetime, and the Levi-Civita–Bertotti–Robinson and Mannheim metrics.
Z. Amirabi
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