Braneworld models with a non-minimally coupled phantom bulk field: a simple way to obtain the -1-crossing at late times

Details Braneworld models with a non-minimally coupled phantom bulk field: a simple way to obtain the -1-crossing at late times Braneworld models with a non-minimally coupled phantom bulk field: a simple way to obtain the -1-crossing at late times

2008-11-26

arxiv.org/abs/0811.4253v2

JCAP 0903:002,2009

Physics

High Energy Physics

High Energy Physics - Theory

11 pages, 2 figures

Scientific paper

10.1088/1475-7516/2009/03/002

We investigate general braneworld models, with a non-minimally coupled phantom bulk field and arbitrary brane and bulk matter contents. We show that the effective dark energy of the brane-universe acquires a dynamical nature, as a result of the non-minimal coupling which provides a mechanism for an indirect "bulk-brane interaction" through gravity. For late-time cosmological evolution and without resorting to special ansatzes or to specific areas of the parameter space, we show that the -1-crossing of its equation-of-state parameter is general and can be easily achieved. As an example we provide a simple, but sufficiently general, approximate analytical solution, that presents the crossing behavior.

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