Abstract
We show, by analyzing its characteristics, that the ghost-free, 5 degree of freedom, Wess-Zumino massive gravity model admits superluminal shock wave solutions and thus is acausal. Ironically, this pathology arises from the very constraint that removes the (sixth) Boulware-Deser ghost mode.
- Received 23 December 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.111101
© 2013 American Physical Society
