Singularities on the brane aren't isotropic

Abstract

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.

5 pages, REVTEX

References in corpus (1)

• Cosmology of a brane radiating gravitons into the extra dimension

Cited by in corpus (11)

• Brane-World Gravity
• Brane-world gravity
• Anisotropy in Bianchi-type brane cosmologies
• Braneworld Tensor Anisotropies in the CMB
• Braneworld cosmological models with anisotropy
• Density perturbations in a brane-world universe with dark radiation
• Are braneworlds born isotropic?
• Brane cosmology with an anisotropic bulk
• Isotropic singularity in inhomogeneous brane cosmological models
• Cosmic No Hair for Braneworlds with a Bulk Dilaton Field
• Spin-Torsion, Braneworlds and Changing Symmetry in the Universe