Dark energy from bulk matter

Abstract

We consider the possibility of getting accelerated expansion and w=-1 crossing in the context of a braneworld cosmological setup, endowed with a bulk energy-momentum tensor. For a given ansatz of the bulk content, we demonstrate that the bulk pressures dominate the dynamics at late times and can lead to accelerated expansion. We also analyze the constraints under which we can get a realistic profile for the effective equation of state and conclude that matter in the bulk has the effect of dark energy on the brane. Furthermore, we show that it is possible to simulate the behavior of a Chaplygin gas using non-exotic bulk matter.

10 pages, 1 figure. Replaced plot, corrected inequality on p.6, substituted $w$ with $w_{eff}$ below eq. 23

References in corpus (1)

• Brane Cosmological Evolution With Bulk Matter

Cited by in corpus (8)

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• String inspired explanation for the super-acceleration of our universe
• Phantom-like behaviour in a brane-world model with curvature effects
• The transition of equation of state of effective dark energy in the DGP model with bulk contents
• Modified brane cosmologies with induced gravity, arbitrary matter content and a Gauss-Bonnet term in the bulk
• Cosmic Acceleration Data and Bulk-Brane Energy Exchange