Density perturbations in the brane-world

Christopher Gordon*, Roy Maartens

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In Randall-Sundrum-type brane-world cosmologies, density perturbations generate a Weyl curvature in the bulk, which in turn back reacts on the brane via stress-energy perturbations. On large scales, the perturbation equations contain a closed system on the brane, which may be solved without solving for the bulk perturbations. Bulk effects produce a nonadiabatic mode, even when the matter perturbations are adiabatic, and alter the background dynamics. As a consequence, the standard evolution of large-scale fluctuations in general relativity is modified. The metric perturbation on large-scales is not constant during high-energy inflation. It is constant during the radiation era, except at most during the very beginning, if the energy is high enough.

Original languageEnglish
Article number044022
JournalPhysical Review D
Issue number4
Early online date30 Jan 2001
Publication statusPublished - 15 Feb 2001


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