SO(3) massive gravity
arXiv:1305.2069 · doi:10.1016/j.physletb.2013.10.031
Abstract
In this paper, we propose a massive gravity theory with 5 degrees of freedom. The mass term is constructed by 3 Stuckelberg scalar fields, which respects SO(3) symmetry in the fields' configuration. By the analysis on the linear cosmological perturbations, we found that such 5 d.o.f are free from ghost instability, gradiant instability, and tachyonic instability.
5 pages, 1 figure, V2: some typos corrected, remove some remarks about sound speed; V3: add some comments about Minkowskian solution, and more references; V4: published version
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