Multiple-scales analysis of cosmological perturbations in brane-worlds

Richard A. Battye, Andrew Mennim

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present a new approximation method for solving the equations of motion for cosmological tensor perturbations in a Randall-Sundrum brane-world model of the type with one brane in a five-dimensional anti-de Sitter spacetime. This method avoids the problem of coordinate singularities inherent in some methods. At leading-order, the zero-mode solution replicates the evolution of perturbations in a four-dimensional Friedmann-Robertson-Walker universe in the absence of any tensor component to the matter perturbation on the brane. At next order, there is a mode-mixing effect, although, importantly, the zero-mode does not source any other modes.
    Original languageEnglish
    Article number124008
    Pages (from-to)1-124008
    Number of pages124007
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume70
    Issue number12
    DOIs
    Publication statusPublished - Dec 2004

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