Results 171 to 180 of about 18,336 (194)

Perfect fluid sources for spatially homogeneous spacetimes

Annals of Physics, 1983
Abstract Spatially homogeneous perfect fluid spacetimes are studied from a point of view which emphasizes the spatial geometry and the action of that subgroup of the spatial gauge group of the three-plus-one formulation of general relativity which is compatible with the spatial homogeneity.
openaire   +2 more sources

Perfect Fluid Spacetimes with a Purely Magnetic Weyl Tensor

General Relativity and Gravitation, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Lozanovski, C., McIntosh, C. B. G.
openaire   +2 more sources

PERFECT FLUID PERTURBATIONS OF ROBERTSON-WALKER SPACETIMES

International Journal of Modern Physics D, 1994
I report on recent work on perturbations of Robertson-Walker spacetimes using the Bardeen-Stewart variables to describe metric perturbations. The gauge freedom available in the formalism is larger than that arising purely from spacetime diffeomorphisms. The associated non-uniqueness and non-locality problems have a simple solution, but the extra gauge
openaire   +1 more source

Killing vectors in conformally flat perfect fluid spacetimes

Classical and Quantum Gravity, 1990
The existence of Killing vectors in conformally flat perfect fluid spacetimes in general relativity is considered. In particular Killing vectors which are neither orthogonal nor parallel to the fluid velocity vector are considered and stationary fields in which the fluid velocity vector is not parallel to the timelike Killing vector field are shown to ...
A Barnes, R R Rowlingson
openaire   +1 more source

Group analysis of a conformal perfect fluid spacetime

Journal of Physics A: Mathematical and Theoretical, 2012
We find new exact solutions of the Einstein field equations for a perfect fluid metric conformal to a spacetime of type D in the Petrov classification scheme. We analyse the complete system of equations using Lie group analysis. While previous work was confined to conformal factors of the form U = U(t, x), we investigate the complete situation U = U(t,
K S Govinder, S Hansraj
openaire   +1 more source

Petrov type II perfect fluid spacetimes with vorticity

Classical and Quantum Gravity, 1985
Summary: We present a stationary spacetime of Robinson-Trautman type containing a perfect fluid with vorticity and obeying the equation of state \(\mu +3p=\) constant. Einstein's equations are reduced to a single fourth-order partial differential equation in two independent variables. A special case of our spacetime refers to a static sphere of perfect
Bonnor, W. B., Davidson, W.
openaire   +2 more sources

Uniqueness properties of purely magnetic LRS perfect fluid spacetimes

Classical and Quantum Gravity, 2002
Summary: We show that all purely magnetic Petrov type D, irrotational, aligned perfect fluid spacetimes are locally rotationally symmetric class III by the Ellis classification. This result is combined with a similar theorem for purely magnetic Petrov type D, shear-free, aligned perfect fluid spacetimes.
openaire   +2 more sources

Static perfect fluid spacetimes on f-Kenmotsu 3-manifolds

ANNALI DELL'UNIVERSITA' DI FERRARA
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Uday Chand De, Arpan Sardar
openaire   +2 more sources

Cosmic censorship in spherically symmetric perfect fluid spacetimes

Classical and Quantum Gravity, 1993
Summary: We show that shell (crossing) singularities are at least marginally trapped, if the ratio of pressure and energy density tends to a non-zero constant for diverging energy density. This result gives strong support for weak cosmic censorship of shell crossing singularities, if a perfect fluid with physically realistic equations of state is ...
openaire   +2 more sources

Geometrical Structure in a Perfect Fluid Spacetime with Conformal Ricci–Yamabe Soliton

Symmetry, 2022
Yanlin Li, Soumendu Roy, Santu Dey
exaly