A Note on Ghost-Free Matter Couplings in Massive Gravity and Multi-Gravity
arXiv:1503.06796 · doi:10.1103/PhysRevD.92.024030
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