Cascading DGP
High Energy Physics - Theory
2008-11-26 v2 Astrophysics
High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.0711.2072,
title = {Cascading DGP},
author = {Claudia de Rham and Gia Dvali and Stefan Hofmann and Justin Khoury and Oriol Pujolas and Michele Redi and Andrew J. Tolley},
journal= {arXiv preprint arXiv:0711.2072},
year = {2008}
}
Comments
4 pages; one reference added and a typo corrected