Isotropization and instability of the brane

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  • 11 March 2001
Abstract
We revisit Wald's no-hair theorem for global anisotropy in the braneworld scenarios. We derive a set of sufficient conditions which must be satisfied by the brane matter and bulk metric so that a homogeneous and anisotropic brane asymptotically evolves to a de Sitter spacetime in presence of a positive cosmological constant on the brane. We discuss the violations of these sufficient conditions and we show that a negative nonlocal energy density or the presence of strong anisotropic stress (i.e. a magnetic field) may lead the brane to collapse. We discuss the generality of these conditions.

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