Perturbations of an anisotropic spacetime: Ideal fluid

Details Perturbations of an anisotropic spacetime: Ideal fluid Perturbations of an anisotropic spacetime: Ideal fluid

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvd..52.5643n&link_type=abstract

Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 52, Issue 10, 15 November 1995, pp.5643-5652

Physics

6

Relativity And Gravitation

Scientific paper

In a previous paper we presented a general formulation that can treat the evolution of perturbations based on a Bianchi type-I background model universe. In this paper we apply the formulation to an ideal fluid system. The background model shows a smooth transition from the shear-dominated anisotropic stage to the ideal-fluid-dominated isotropic stage. In the shear-dominated stage the background anisotropy causes the couplings of the density perturbation with the gravitational wave and the rotation. The asymptotic solutions in the shear-dominated stage are derived. We investigate the solutions in the comoving gauge and the uniform-curvature gauge. Equations are presented using dimensionless variables; thus they are suitable for numerical investigation.

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