Tilted Bianchi VII_0 cosmologies -- the radiation bifurcation

Details Tilted Bianchi VII_0 cosmologies -- the radiation bifurcation Tilted Bianchi VII_0 cosmologies -- the radiation bifurcation

2006-01-11

arxiv.org/abs/gr-qc/0601040v2

Class.Quant.Grav. 23 (2006) 3215-3234

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

22 pages, no figures

Scientific paper

10.1088/0264-9381/23/9/029

We derive the late-time behaviour of tilted Bianchi VII_0 cosmologies with an irrotational radiation fluid as source, and give the asymptotic form of the general solution as $t \to +\infty$, making comparisons with the dust-filled models. At first sight the radiation-filled models appear to approximate the flat FL model at late times, since the Hubble-normalized shear and the tilt tend to zero and the density parameter tends to one. The Hubble-normalized Weyl curvature diverges, however, indicating that physically significant anisotropy remains. We also discuss the influence of a cosmological constant on this phenomenon.

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