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arxiv: 0711.2072 · v2 · submitted 2007-11-13 · ✦ hep-th · astro-ph· hep-ph

Cascading DGP

Claudia de Rham , Gia Dvali , Stefan Hofmann , Justin Khoury , Oriol Pujolas , Michele Redi , Andrew J. Tolley This is my paper
classification ✦ hep-th astro-phhep-ph
keywords braneflatinducedattemptsbehaviorbulkcascadescascading
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We present a higher codimension generalization of the DGP scenario which, unlike previous attempts, is free of ghost instabilities. The 4D propagator is made regular by embedding our visible 3-brane within a 4-brane, each with their own induced gravity terms, in a flat 6D bulk. The model is ghost-free if the tension on the 3-brane is larger than a certain critical value, while the induced metric remains flat. The gravitational force law `cascades' from a 6D behavior at the largest distances followed by a 5D and finally a 4D regime at the shortest scales.

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