Bare and effective fluid description in brane world cosmology

Details Bare and effective fluid description in brane world cosmology Bare and effective fluid description in brane world cosmology

2009-06-12

arxiv.org/abs/0906.2403v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages

Scientific paper

An effective fluid description, for a brane world model in five dimensions, is discussed for both signs of the brane tension. We found several cosmological scenarios where the effective equation differs widely from the bare equation of state. For universes with negative brane tension, with a bare fluid satisfying the strong energy condition, the effective fluid can cross the barrier $\omega _{eff} =-1$.

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