Nonsingular vacuum cosmologies with a variable cosmological term

Details Nonsingular vacuum cosmologies with a variable cosmological term Nonsingular vacuum cosmologies with a variable cosmological term

2003-02-10

arxiv.org/abs/gr-qc/0302029v1

Class.Quant.Grav. 20 (2003) 3797-3814

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

revtex, 10 pages, 8 eps figures

Scientific paper

10.1088/0264-9381/20/16/317

We present nonsingular cosmological models with a variable cosmological term described by the second-rank symmetric tensor $\Lambda_{mn}$ evolving from $\Lambda g_{mn}$ to $\lambda g_{mn}$ with $\lambda < \Lambda$. All $\Lambda_{mn}$ dominated cosmologies belong to Lemaitre type models for an anisotropic perfect fluid. The expansion starts from a nonsingular nonsimultaneous de Sitter bang, with $\Lambda$ on the scale responsible for the earliest accelerated expansion, which is followed by an anisotropic Kasner type stage. For a certain class of observers these models can be also identified as Kantowski-Sachs models with regular R regions. For Kantowski-Sachs observers the cosmological evolution starts from horizons with a highly anisotropic ``null bang'' where the volume of the spatial section vanishes. We study in detail the spherically symmetric case and consider the general features of cosmologies with planar and pseudospherical symmetries. Nonsingular $\Lambda_{mn}$ dominated cosmologies are Bianchi type I in the planar case and hyperbolic analogs of the Kantowski-Sachs models in the pseudospherical case. At late times all models approach a de Sitter asymptotic with small $\lambda$.

Affiliated with

Also associated with

No associations

Rating

Nonsingular vacuum cosmologies with a variable cosmological term does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Nonsingular vacuum cosmologies with a variable cosmological term, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nonsingular vacuum cosmologies with a variable cosmological term will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-73078