Singularities on the brane aren't isotropic

Details Singularities on the brane aren't isotropic Singularities on the brane aren't isotropic

2002-07-20

arxiv.org/abs/hep-th/0207189v1

Phys.Rev. D66 (2002) 101301

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, REVTEX

Scientific paper

10.1103/PhysRevD.66.101301

Recent studies of homogeneous anisotropic universe models in the brane world scenario show that the cosmological singularity in this context is isotropic. It has therefore been suggested that this may be a generic feature of singularities on the brane, even in the inhomogeneous case. Using a perturbative approach, we show that this is not the case. As in the GR case, the presence of decaying modes in the perturbations signal the instability (in the past) of the isotropic singularity. The brane universe is therefore not born with isotropy built in: as in standard cosmology, the observed large-scale isotropy and homogeneity remains to be explained.

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