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Abstract: We investigate the cosmological properties of an -induced gravity- branescenario in the absence of mirror symmetry with respect to the brane. We findthat brane evolution can proceed along one of four distinct branches. Bycontrast, when mirror symmetry is imposed, only two branches exist, one ofwhich represents the self-accelerating brane, while the other is the so-callednormal branch. This model incorporates many of the well-known possibilities ofbrane 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 wayof inducing a sufficiently small cosmological constant on the brane. A smallpositive Lambda-term in this case is induced by a small asymmetry in thevalues of bulk fundamental constants on the two sides of the brane.



Autor: Yuri Shtanov, Varun Sahni, Arman Shafieloo, Alexey Toporensky

Fuente: https://arxiv.org/



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