Density perturbations in a braneworld universe with dark radiation

B. Gumjudpai, Roy Maartens, C. Gordon

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We investigate the effects on cosmological density perturbations of dark radiation in a Randall–Sundrum 2-type braneworld. Dark radiation in the background is limited by observational constraints to be a small fraction of the radiation energy density, but it has an interesting qualitative effect in the radiation era. On large scales, it serves to slightly suppress the radiation density perturbations at late times, while boosting the perturbations in dark radiation. In a kinetic (stiff) era, the suppression is much stronger, and drives the density perturbations to zero
Original languageEnglish
Pages (from-to)3295-3306
Number of pages12
JournalClassical and Quantum Gravity
Issue number15
Publication statusPublished - 7 Aug 2003


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