%0 Journal Article
%T Massive Gravity Acausality Redux
%A S. Deser
%A K. Izumi
%A Y. C. Ong
%A A. Waldron
%J Physics
%D 2013
%I arXiv
%R 10.1016/j.physletb.2013.09.001
%X Massive gravity (mGR) is a 5(=2s+1) degree of freedom, finite range extension of GR. However, amongst other problems, it is plagued by superluminal propagation, first uncovered via a second order shock analysis. First order mGR shock structures have also been studied, but the existence of superluminal propagation in that context was left open. We present here a concordance of these methods, by an explicit (first order) characteristic matrix computation, which confirms mGR's superluminal propagation as well as acausality.
%U http://arxiv.org/abs/1306.5457v3