Higher-dimensional perturbations of the vacuum energy density

Details Higher-dimensional perturbations of the vacuum energy density Higher-dimensional perturbations of the vacuum energy density

2008-05-27

arxiv.org/abs/0805.4091v1

JHEP0806:009,2008

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, no figures, to appear in JHEP

Scientific paper

10.1088/1126-6708/2008/06/009

The vacuum energy density arising from the broken supersymmetry of the (standard-model) fields living on a brane cannot be fully "off-loaded" to the bulk: even assuming the existence of an effective "self-tuning" mechanism, a small fraction of the transferred energy "bunces back" to the brane, as a backreaction of the supersymmetry breaking gravitationally transmitted to the bulk. In that case the SUSY scale of the brane has to be bounded, to guarantee the consistency of such a residual energy density with current large-scale phenomonological constraints. This effect is illustrated by computing the zero-point energies of the tower of (higher-dimensional) massive states associated to tensor metric fluctuations on a brane embedded in a warped bulk geometry, and it is shown to be independent of the number of compact or non-compact extra dimensions.

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