Cascading DGP

Details Cascading DGP Cascading DGP

2007-11-13

arxiv.org/abs/0711.2072v2

Phys.Rev.Lett.100:251603,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages; one reference added and a typo corrected

Scientific paper

10.1103/PhysRevLett.100.251603

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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