Inconsistency of interacting, multi-graviton theories
Abstract
We investigate, in any spacetime dimension >=3, the problem of consistent couplings for a finite collection of massless, spin-2 fields described, in the free limit, by a sum of Pauli-Fierz actions. We show that there is no consistent (ghost-free) coupling, with at most two derivatives of the fields, that can mix the various "gravitons". In other words, there are no Yang-Mills-like spin-2 theories. The only possible deformations are given by a sum of individual Einstein-Hilbert actions. The impossibility of cross-couplings subsists in the presence of scalar matter. Our approach is based on the BRST-based deformation point of view and uses results on the so-called "characteristic cohomology" for massless spin-2 fields which are explained in detail.
Keywords
Cite
@article{arxiv.hep-th/0007220,
title = {Inconsistency of interacting, multi-graviton theories},
author = {Nicolas Boulanger and Thibault Damour and Leonardo Gualtieri and Marc Henneaux},
journal= {arXiv preprint arXiv:hep-th/0007220},
year = {2009}
}
Comments
44+1 pages, no figures. Case of an infinite number of gravitons treated more completely, comparison with work by Aragone and Deser on gravitational coupling of a single massless spin-2 field discussed