Results 81 to 90 of about 1,515,012 (182)

Perfect fluid with shear viscosity and spacetime evolution

Chinese Journal of Physics
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 the energy density individually.
Inyong Cho, Rajibul Shaikh
openaire   +3 more sources

Influences of perfect fluid dark matter on coinciding validity of the weak gravity and weak cosmic censorship conjectures for Kerr-Newman black hole

Nuclear Physics B
One of the main difficulties in general relativity is the potential conflict between the weak gravity conjecture (WGC) and weak cosmic censorship conjecture (WCCC).
Jafar Sadeghi, Saeed Noori Gashti
doaj   +1 more source

Reissner-Nordström black holes surrounded by perfect fluid dark matter: Testing the viability of weak gravity conjecture and weak cosmic censorship conjecture simultaneously

Physics Letters B
A possible violation of the weak gravity conjecture (WGC) by cosmic censorship is one of the major challenges in the field of general relativity. The cosmic censorship is a fundamental principle that ensures the consistency of the theory of gravity ...
Jafar Sadeghi, Saeed Noori Gashti
doaj   +1 more source

Conformally 2+2-decomposable perfect fluid space-times with constant curvature factor manifolds

, 2012
Conformally 2 + 2-decomposable non-conformally flat spacetimes, which are the solutions of the Einstein field equations with a perfect fluid source, are discussed.
Van den Bergh, Norbert
core   +1 more source

Weakly B-Symmetric Warped Product Manifolds with Applications

Axioms
This work presents a comprehensive study of weakly B-symmetric warped product manifolds (WBS)n, a natural extension of several classical curvature-restricted geometries including B-flat, B-parallel, and B-recurrent manifolds.
Bang-Yen Chen, Sameh Shenawy, Uday Chand De, Safaa Ahmed, Hanan Alohali   +4 more
doaj   +1 more source

Conformal Einstein solitons on a perfect fluid spacetime

Boletim da Sociedade Paranaense de Matemática
The objective of this research is to investigate the geometrical composition of a perfect fluid spacetime with a torse-forming vector field in connection with Conformal Einstein Soliton and Conformal -Einstein Soliton. Also, We have studied the conditions for a Conformal Einstein Soliton to be shrinking or expanding or steady.
Shivaprasanna G. S., Md. Samiul Haque, Somashekhara G.   +2 more
openaire   +1 more source

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

Sci Rep, 2022
Nouri-Zonoz M, Nourizonoz A.
europepmc   +1 more source

Almost Schouten solitons and perfect fluid spacetimes

Filomat
In this study, we assume that a perfect fluid is the source of the gravitational field while analyzing the solutions to the Einstein field equations. With this new and innovative approach, we study almost Schouten and gradient Schouten solitons on perfect fluid spacetimes.
Arpan Sardar, Changhwa Woo, Uday De
openaire   +1 more source

On the Spherical Symmetry of Perfect-Fluid Stellar Models in General Relativity [PDF]

, 2012
It is well known in Newtonian theory that static self-gravitating perfect fluids in a vacuum are necessarily spherically symmetric. The necessity of spherical symmetry of perfect-fluid static spacetimes with constant density in general relativity is ...
Brewer, Joshua M
core  

Characterisation of orthogonal perfect fluid cosmological spacetimes

, 1994
We consider the general orthogonal metric separable in space and time variables in comoving coordinates. We then characterise perfect fluid models admitted by such a metric. It turns out that the homogeneous models can only be either FLRW or Bianchi I while the inhomogeneous ones can only admit $G_2 $ (two mutually as well as hypersurface orthogonal ...
Dadhich, Naresh, Patel, L. K., Govinder, K. S., Leach, P. G. L.   +3 more
openaire   +2 more sources