Regular homogeneous T-models with vacuum dark fluid

Details Regular homogeneous T-models with vacuum dark fluid Regular homogeneous T-models with vacuum dark fluid

2007-05-16

arxiv.org/abs/0705.2368v1

Class.Quant.Grav.24:5803-5816,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, no figures, Latex

Scientific paper

10.1088/0264-9381/24/23/005

We present the class of regular homogeneous T-models with vacuum dark fluid, associated with a variable cosmological term. The vacuum fluid is defined by the symmetry of its stress-energy tensor, i.e., its invariance under Lorentz boosts in a distinguished spatial direction (p_j=-\rho), which makes this fluid essentially anisotropic and allows its density to evolve. Typical features of homogeneous regular T-models are: the existence of a Killing horizon; beginning of the cosmological evolution from a null bang at the horizon; the existence of a regular static pre-bang region visible to cosmological observers; creation of matter from anisotropic vacuum, accompanied by very rapid isotropization. We study in detail the spherically symmetric regular T-models on the basis of a general exact solution for a mixture of the vacuum fluid and dustlike matter and apply it to give numerical estimates for a particular model which illustrates the ability of cosmological T-models to satisfy the observational constraints.

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