Density perturbations in a brane-world universe with dark radiation

Abstract

We investigate the effects on cosmological density perturbations of dark radiation in a Randall-Sundrum 2 type brane-world. 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.

10 pages, 4 figures

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• Observational Constraints on Dark Radiation in Brane Cosmology
• Cosmology of a brane radiating gravitons into the extra dimension
• Tracking quintessential inflation from brane worlds
• Braneworld Tensor Anisotropies in the CMB
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• Quantum-mechanical generation of gravitational waves in braneworld
• Covariant gravitational dynamics in 3+1+1 dimensions
• Non-Minimal Warm Inflation and Perturbations on the Warped DGP Brane with Modified Induced Gravity
• Brane cosmology, Weyl fluid, and density perturbations
• Torsion, Dirac Field, Dark Matter and Dark Radiation
• Cosmological Perturbations During Radion Stabilization
• 3+1+1 dimensional covariant gravitational dynamics on an asymmetrically embedded brane
• One more step toward the noncommutative brane inflation
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• Scalar cosmological perturbations in the Gauss-Bonnet braneworld