2015/08/31 by Kurt Hinterbichler, Mehdi Saravani · 1 citation
Physics and Astronomy · #hep-th #gr-qc
paper · pdf · doi:10.1103/physrevd.93.065006
published as Phys. Rev. D 93, 065006 (2016) · 17 pages. v2 minus sign fixed, other small changes
arxiv created 2016/04/26 · arxiv updated 2016/04/27
Curvature squared terms, when added to the Einstein-Hilbert action and treated non-perturbatively, generically result in the propagation of an extra massive scalar state and an extra massive spin-2 ghost state. Using the Stueckelberg trick, we study the high-energy limit in which the mass of the spin-2 state is taken to zero, with strong- coupling scales held fixed. The Stueckelberg approach makes transparent the interplay between the ghost graviton and the healthy graviton which allows the theory to evade the usual lambda-3 strong coupling scale of massive gravity and become renormalizable, at the expense of stability.