Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-01-20
JCAP 04 (2009) 023
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages, 4 figures. New results and two figures discussing transient acceleration are included. Version accepted for publicat
Scientific paper
10.1088/1475-7516/2009/04/023
We investigate the cosmological properties of an "induced gravity" brane scenario in the absence of mirror symmetry with respect to the brane. We find that brane evolution can proceed along one of four distinct branches. By contrast, when mirror symmetry is imposed, only two branches exist, one of which represents the self-accelerating brane, while the other is the so-called normal branch. This model incorporates many of the well-known possibilities of brane cosmology including phantom acceleration (w < -1), self-acceleration, transient acceleration, quiescent singularities, and cosmic mimicry. Significantly, the absence of mirror symmetry also provides an interesting way of inducing a sufficiently small cosmological constant on the brane. A small (positive) Lambda-term in this case is induced by a small asymmetry in the values of bulk fundamental constants on the two sides of the brane.
Sahni Varun
Shafieloo Arman
Shtanov Yuri
Toporensky Alexey
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