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Scalar and tensor perturbations arising in an inflationary braneworld scenario driven by a single scalar field are considered, where the bulk on either side of the brane corresponds to anti--de Sitter spaces with different cosmological constants. A consistency relation between the two spectra is derived and found to have an identical form to that arising in standard single-field inflation based on conventional Einstein gravity. The de Sitter/conformal field theory correspondence may provide further insight into the origin of this degeneracy. Possible ways of lifting such a degeneracy are discussed.
Huey et al. (Fri,) studied this question.
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