Scalar perturbations in braneworld cosmology

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dc.creatorCardoso, Antonio
dc.creatorHiramatsu, Takashi
dc.creatorKoyama, Kazuya
dc.creatorSeahra, Sanjeev S.
dc.date2007-05-11
dc.date.accessioned2026-07-07T13:15:17Z
dc.date.available2026-07-07T13:15:17Z
dc.descriptionWe 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.
dc.description17 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0705.1685
dc.identifierhttp://arxiv.org/abs/0705.1685
dc.identifierJCAP 0707:008,2007
dc.identifierdoi:10.1088/1475-7516/2007/07/008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230430
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Theory
dc.titleScalar perturbations in braneworld cosmology
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