de Sitter Brane Gravity: from Close-Up to Panorama
Abstract
We find explicitly the induced graviton propagator on de Sitter branes embedded in various five-dimensional spacetimes; de Sitter branes in AdS and Minkowski space are particular cases. By studying the structure of the momentum-space propagator, we are able to extract interesting physics, much of which is qualitatively different from that of flat branes. We find that 1) there can be a set of graviton-like particles which mediate brane gravity at different scales; 2) localized gravity can exist even on de Sitter branes in Minkowski space; 3) Kaluza-Klein modes also contribute to conventional 4-D gravity for de Sitter branes in AdS; and 4) Newton's constant can vary considerably with scale. We comment on the implications for the effective cosmological constant.
Keywords
Cite
@article{arxiv.hep-th/0012231,
title = {de Sitter Brane Gravity: from Close-Up to Panorama},
author = {Maulik K. Parikh and Sergey N. Solodukhin},
journal= {arXiv preprint arXiv:hep-th/0012231},
year = {2009}
}
Comments
15 pages, latex, 1 figure; added appendix of useful Legendre formulas, minor modifications, more references, to appear in Phys. Lett. B