Constrained Perturbative Expansion of the DGP Model
arXiv:hep-th/0502020 · doi:10.1016/j.physletb.2005.03.062
Abstract
We address the vDVZ discontinuity of the 5D DGP model which consists of a 3-brane residing in a flat, infinite-volume bulk. Following a suggestion by Gabadadze [hep-th/0403161], we implement a constrained perturbative expansion parametrized by brane gauge parameters. We explore the parameter space and show that the DGP solution exhibiting the vDVZ discontinuity corresponds to a set of measure zero.
12 pages incl. 1 figure. v2: expanded discussion on poles of propagator; to appear in Phys. Lett. B