Brane-World Cosmology, Bulk Scalars and Perturbations
P. Brax, C. van de Bruck, A.C. Davis
TL;DR
This paper explores cosmological models involving brane worlds with bulk scalar fields, analyzing their background evolution and density perturbations, and comparing these to established Randall-Sundrum and scalar-tensor theories.
Contribution
It introduces a brane-world model motivated by supergravity, providing new insights into background evolution and density contrast evolution in such scenarios.
Findings
Differences in density contrast evolution compared to Randall-Sundrum models.
Impact of bulk scalar fields on cosmological perturbations.
Comparison with 4D scalar-tensor theories shows distinct behaviors.
Abstract
We investigate aspects of cosmology in brane world theories with a bulk scalar field. We concentrate on a recent model motivated from supergravity in singular spaces. After discussing the background evolution of such a brane-world, we present the evolution of the density contrast. We compare our results to those obtained in the (second) Randall-Sundrum scenario and usual 4D scalar-tensor theories.
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