http://arxiv.org/abs/1408.5131
In this paper we construct a family of consistent ways in which matter can couple to one or more `metrics’/spin-2 fields in the vielbein formulation. We do so subject to requiring the weak equivalence principle and the absence of ghosts from pure spin-2 interactions generated by the matter action. Results are presented for Massive, Bi- and Multi-Gravity theories and we give explicit expressions for the effective matter metric in all of these cases.
J. Noller and S. Melville
Mon, 25 Aug 14
5/43
Comments: 16 pages
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