Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-12-24
Phys.Rev. D69 (2004) 124032
Physics
High Energy Physics
High Energy Physics - Theory
33 LaTex pages
Scientific paper
10.1103/PhysRevD.69.124032
Large-distance modification of gravity may be the mechanism for solving the cosmological constant problem. A simple model of the large-distance modification -- four-dimensional (4D) gravity with the hard mass term-- is problematic from the theoretical standpoint. Here we discuss a different model, the brane-induced gravity, that effectively introduces a soft graviton mass. We study the issues of unitarity, analyticity and causality in this model in more than five dimensions. We show that a consistent prescription for the poles of the Green's function can be specified so that 4D unitarity is preserved. However, in certain instances 4D analyticity cannot be maintained when theory becomes higher dimensional. As a result, one has to sacrifice 4D causality at distances of the order of the present-day Hubble scale. This is a welcome feature for solving the cosmological constant problem, as was recently argued in the literature. We also show that, unlike the 4D massive gravity, the model has no strong-coupling problem at intermediate scales.
Gabadadze Gregory
Shifman Michael
No associations
LandOfFree
Softly Massive 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 Softly Massive Gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Softly Massive Gravity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-625105