Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-12-16
Phys.Rev. D69 (2004) 101303
Physics
High Energy Physics
High Energy Physics - Theory
Changed to match published version
Scientific paper
10.1103/PhysRevD.69.101303
It has recently been suggested that an isotropic singularity may be a generic feature of brane cosmologies, even in the inhomogeneous case. Using the covariant and gauge-invariant approach we present a detailed analysis of linear perturbations of the isotropic model ${\cal F}_b$ which is a past attractor in the phase space of homogeneous Bianchi models on the brane. We find that for matter with an equation of state parameter $\gamma > 1$, the dimensionless variables representing generic anisotropic and inhomogeneous perturbations decay as $t\to 0$, showing that the model ${\cal F}_b$ is asymptotically stable in the past. We conclude that brane universes are born with isotropy naturally built-in, contrary to standard cosmology. The observed large-scale homogeneity and isotropy of the universe can therefore be explained as a consequence of the initial conditions if the brane-world paradigm represents a description of the very early universe.
Bruni Marco
Coley Alan
Dunsby Peter K. S.
Goheer Naureen
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