Brane Cosmological Evolution With Bulk Matter
C. Bogdanos, K. Tamvakis

TL;DR
This paper explores brane cosmology with bulk matter, deriving exact solutions that show accelerated expansion and allow the dark energy equation of state to cross w=-1 without exotic matter.
Contribution
It introduces a phenomenological approach to bulk matter in brane cosmology and finds exact solutions demonstrating accelerated expansion and w=-1 crossing.
Findings
Exact solutions with accelerated expansion
Dark energy equation of state crosses w=-1
Bulk matter influences brane cosmological dynamics
Abstract
We consider the cosmological evolution of a brane for general bulk matter content. In our setup the bulk pressure and the energy exchange densities are comparable to the brane energy density. Adopting a phenomenological fluid ansatz and generalizations of it, we derive a set of exact solutions of the Friedmann equation that exhibit accelerated expansion. We find that the effective equation of state parameter for the dark energy can exhibit w=-1 crossing without the presence of exotic matter.
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