Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-11-25
Phys.Rev.D73:064026,2006
Physics
High Energy Physics
High Energy Physics - Theory
43 pages, 13 figures
Scientific paper
10.1103/PhysRevD.73.064026
Gravity in five-dimensional braneworld backgrounds often exhibits problematic features, including kinetic ghosts, strong coupling, and the vDVZ discontinuity. These problems are an obstacle to producing and analyzing braneworld models with interesting and potentially observable modifications of 4d gravity. We examine these problems in a general AdS_5/AdS_4 setup with two branes and localized curvature from arbitrary brane kinetic terms. We use the interval approach and an explicit ``straight'' gauge-fixing. We compute the complete quadratic gauge-fixed effective 4d action, as well as the leading cubic order corrections. We compute the exact Green's function for gravity as seen on the brane. In the full parameter space, we exhibit the regions which avoid kinetic ghosts and tachyons. We give a general formula for the strong coupling scale, i.e. the energy scale at which the linearized treatment of gravity breaks down, for relevant regions of the parameter space. We show how the vDVZ discontinuity can be naturally but nontrivially avoided by ultralight graviton modes. We present a direct comparison of warping versus localized curvature in terms of their effects on graviton mode couplings. We exhibit the first example of DGP-like crossover behavior in a general warped setup.
Bao Ruoyu
Carena Marcela
Lykken Joseph
Park Minjoon
Santiago Jose
No associations
LandOfFree
Revamped Braneworld Gravity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Revamped Braneworld Gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Revamped Braneworld Gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-365242