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On Cosmological Perturbations on a Brane in an Anti-de Sitter Bulk

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arxiv hep-th/0012073 v1 pith:NP6CYNXD submitted 2000-12-08 hep-th astro-phgr-qchep-ph

On Cosmological Perturbations on a Brane in an Anti-de Sitter Bulk

classification hep-th astro-phgr-qchep-ph
keywords bulkperturbationsbraneanti-decosmologicalequationsgaugegravitons
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this paper, we consider cosmological perturbations on a brane universe embedded in an Anti-de Sitter bulk. We use a novel gauge, in which the full five-dimensional problem is in principle solvable. In this gauge we derive the equations for scalar, vector and tensor perturbations. These equations are necessary in order to calculate microwave background anisotropies in this particular scenario. Throughout the paper, we draw attention to the influence of the bulk gravitons, which act as a source for the perturbations on the brane. In addition, we find that isocurvature modes are generated due to the influence of bulk gravitons.

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