Structure formation on the brane: A mimicry

Details Structure formation on the brane: A mimicry Structure formation on the brane: A mimicry

2006-06-20

arxiv.org/abs/gr-qc/0606085v2

Phys.Rev. D74 (2006) 024005

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages. Matches published version

Scientific paper

10.1103/PhysRevD.74.024005

We show how braneworld cosmology with bulk matter can explain structure formation. In this scenario, the nonlocal corrections to the Friedmann equations supply a Weyl fluid that can dominate over matter at late times due to the energy exchange between the brane and the bulk. We demonstrate that the presence of the Weyl fluid radically changes the perturbation equations, which can take care of the fluctuations required to account for the large amount of inhomogeneities observed in the local universe. Further, we show how this Weyl fluid can mimic dark matter. We also investigate the bulk geometry responsible for the scenario.

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