Bi-metric theory of gravity from the non-chiral Plebanski action
arXiv:1003.4701 · doi:10.1103/PhysRevD.82.064003
Abstract
We study a modification of the Plebanski action for general relativity, which leads to a modified theory of gravity with eight degrees of freedom. We show how the action can be recasted as a bi-metric theory of gravity, and expanding around a bi-flat background we identify the six extra degrees of freedom with a second, massive graviton and a scalar mode.
28 pages. v2 minor typos corrected
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