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Curvature squared terms, when added to the Einstein-Hilbert action andtreated non-perturbatively, generically result in the propagation of an extramassive scalar state and an extra massive spin-2 ghost state. Using theStueckelberg trick, we study the high-energy limit in which the mass of thespin-2 state is taken to zero, with strong- coupling scales held fixed. TheStueckelberg approach makes transparent the interplay between the ghostgraviton and the healthy graviton which allows the theory to evade the usuallambda-3 strong coupling scale of massive gravity and become renormalizable, atthe expense of stability.

A Stueckelberg Approach to Quadratic Curvature Gravity and its Decoupling Limits