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de Sitter Brane Gravity: from Close-Up to Panorama | | Maulik K. Parikh
; Sergey N. Solodukhin
; | | Date: |
24 Dec 2000 | | Journal: | Phys.Lett. B503 (2001) 384-393 | | Subject: | hep-th gr-qc hep-ph | | 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. | | Source: | arXiv, hep-th/0012231 | | Services: | Forum | Review | PDF | Favorites | |
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