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arXiv · 1508.02401

A Stueckelberg Approach to Quadratic Curvature Gravity and its Decoupling Limits

Kurt Hinterbichler·Mehdi Saravani
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Abstract

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.

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Kurt Hinterbichler, Mehdi Saravani. 2015-08-10. A Stueckelberg Approach to Quadratic Curvature Gravity and its Decoupling Limits. https://doi.org/10.1103/physrevd.93.065006

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