Higher-dimensional perturbations of the vacuum energy density
Abstract
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 ``bounces 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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- June 2008
- DOI:
- 10.1088/1126-6708/2008/06/009
- arXiv:
- arXiv:0805.4091
- Bibcode:
- 2008JHEP...06..009G
- Keywords:
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- High Energy Physics - Theory;
- Astrophysics;
- General Relativity and Quantum Cosmology
- E-Print:
- 10 pages, no figures, to appear in JHEP