Metastable gravity on classical defects

Abstract

We discuss the realization of metastable gravity on classical defects in infinite-volume extra dimensions. In dilatonic Einstein gravity, it is found that the existence of metastable gravity on the defect core requires violation of the Dominant Energy Condition for codimension Nc = 2 defects. This is illustrated with a detailed analysis of a six-dimensional hyperstring minimally coupled to dilaton gravity. We present the general conditions under which a codimension Nc > 2 defect admits metastable modes, and find that they differ from lower codimensional models in that, under certain conditions, they do not require violation of energy conditions to support quasi-localized gravity.

10 pages, 3 figures, uses RevTeX, typos corrected, matches published version

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• Gravitational resonances on $f(R)$-brane
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• Higher-dimensional DBI Solitons
• Charged seven-dimensional spacetimes with spherically symmetric extra-dimensions
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