Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-09-12
JHEP 0311 (2003) 038
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, 2 fig, JHEP3 style required, typos corrected
Scientific paper
10.1088/1126-6708/2003/11/038
We study whether modification of gravity at large distances is possible in warped backgrounds with two branes and a brane-induced term localized on one of the branes. We find that there are three large regions in the parameter space where the theory is weakly coupled up to high energies. In one of these regions gravity on the brane is four-dimensional at arbitrarily large distances, and the induced Einstein term results merely in the renormalization of the 4d Planck mass. In the other two regions the behavior of gravity changes at ultra-large distances; however, radion becomes a ghost. In parts of these regions, both branes have positive tensions, so the only reason for the appearance of the ghost field is the brane-induced term. In between these three regions, there are domains in the parameter space where gravity is strongly coupled at phenomenologically unacceptable low energy scale.
Dubovsky S. L.
Libanov M. V.
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