Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2007/07/008
Keywords
extra dimensions; cosmology with extra dimensions; cosmological perturbation theory; cosmological applications of theories with extra dimensions
Funding
- Engineering and Physical Sciences Research Council [EP/C500067/1] Funding Source: researchfish
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We study the behaviour of scalar perturbations in the radiation-dominated era of Randall-Sundrum braneworld cosmology by numerically solving the coupled bulk and brane master wave equations. We find that density perturbations with wavelengths less than a critical value ( set by the bulk curvature length) are amplified during horizon re-entry. This means that the radiation-era matter power spectrum will be at least an order of magnitude larger than the predictions of general relativity (GR) on small scales. Conversely, we explicitly confirm from simulations that the spectrum is identical to GR on large scales. Although this magnification is not relevant for the cosmic microwave background or measurements of large scale structure, it will have some bearing on the formation of primordial black holes in Randall-Sundrum models.
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