Strong Coupling vs. 4-D Locality in Induced Gravity
High Energy Physics - Theory
2009-11-10 v2
Abstract
We re-examine the problem of strong coupling in a regularized version of DGP (or ``brane-induced'') gravity. We find that the regularization of ref. hep-th/0304148 differs from DGP in that it does not exhibit strong coupling or ghosts up to cubic order in the interactions. We suggest that the nonlocal nature of the theory, when written in terms of the 4-D metric, is a plausible reason for this phenomenon. Finally, we briefly discuss the possible behavior of the model at higher-order in perturbation theory.
Cite
@article{arxiv.hep-th/0401211,
title = {Strong Coupling vs. 4-D Locality in Induced Gravity},
author = {M. Porrati and J. -W. Rombouts},
journal= {arXiv preprint arXiv:hep-th/0401211},
year = {2009}
}
Comments
19 pages, accepted for publication in PRD