Unconventional cosmology on the (thick) brane

Details Unconventional cosmology on the (thick) brane Unconventional cosmology on the (thick) brane

2005-05-18

arxiv.org/abs/hep-th/0505156v2

JCAP0603:015,2006

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, v2. eq.(17) corrected, comments on effective theory changed

Scientific paper

10.1088/1475-7516/2006/03/015

We consider the cosmology of a thick codimension 1 brane. We obtain the matching conditions leading to the cosmological evolution equations and show that when one includes matter with a pressure component along the extra dimension in the brane energy-momentum tensor, the cosmology is of non-standard type. In particular one can get acceleration when a dust of non-relativistic matter particles is the only source for the (modified) Friedman equation. Our equations would seem to violate the conservation of energy-momentum from a 4D perspective, but in 5D the energy-momentum is conserved. One could write down an effective conserved 4D energy-momentum tensor attaching a ``dark energy'' component to the energy-momentum tensor of matter that has pressure along the extra dimension. This extra component could, on a cosmological scale, be interpreted as matter-coupled quintessence. We comment on the effective 4D description of this effect in terms of the time evolution of a scalar field (the 5D radion) coupled to this kind of matter.

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