A Note on Ghost-Free Matter Couplings in Massive Gravity and Multi-Gravity

Abstract

We consider a recently proposed non-minimal matter coupling in massive gravity and multi-gravity. We argue that, when formulated in terms of unconstrained vielbeins, this matter coupling contains the primary constraints necessary to remove the Boulware-Deser ghost to all orders away from the decoupling limit.

4 pages, v2 comments, refs added, appearing in PRD

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