TY - JOUR
T1 - Strong coupling versus 4D locality in induced gravity
AU - Porrati, M.
AU - Rombouts, J.
PY - 2004
Y1 - 2004
N2 - We reexamine the problem of strong coupling in a regularized version of Dvali-Gabadadze-Porrati (DGP) (or “brane-induced”) gravity. We find that the regularization of Kolanovic, Porrati, and Rombouts [Phys. Rev. D 68, 064018 (2003)] differs from DGP in that it does not exhibit strong coupling or ghosts up to cubic order in the interactions. We suggest that the nonlocal nature of the theory, when written in terms of the 4D metric, is a plausible reason for this phenomenon. Finally, we briefly discuss the possible behavior of the model at higher order in perturbation theory.
AB - We reexamine the problem of strong coupling in a regularized version of Dvali-Gabadadze-Porrati (DGP) (or “brane-induced”) gravity. We find that the regularization of Kolanovic, Porrati, and Rombouts [Phys. Rev. D 68, 064018 (2003)] differs from DGP in that it does not exhibit strong coupling or ghosts up to cubic order in the interactions. We suggest that the nonlocal nature of the theory, when written in terms of the 4D metric, is a plausible reason for this phenomenon. Finally, we briefly discuss the possible behavior of the model at higher order in perturbation theory.
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U2 - 10.1103/PhysRevD.69.122003
DO - 10.1103/PhysRevD.69.122003
M3 - Article
AN - SCOPUS:3843140415
SN - 1550-7998
VL - 69
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
ER -