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We present our analysis of the theory constructed in 1965 by Ogievetsky andPolubarinov (OP) -- the first ever theory of interacting massive gravitons. Itsmass term is adjusted in such a way that the non-linear field equations implyas a consequence the linear Hilbert-Lorentz condition, which restricts the spinof states in the theory. Strikingly, for special parameter values this theorycoincides with one of the "ghost-free" massive gravity models rediscovered onlyin 2010. For generic parameter values, however, it propagates 6 degrees offreedom and shows ghost around flat space. Surprizingly, we find that the deSitter space remains stable for a large region of the parameter space, providedthat the Hubble expansion rate is large enough, hence the Boulware-Deser modeis benign in this case. We study also other solutions and find that the Milneuniverse -- a sector of Minkowski space -- is stable in the UV limit. Thispresumably implies that at the non-linear level the ghost instability in flatspace develops only for long waves, similarly to the classical Jeansinstability.

The Ogievetsky-Polubarinov massive gravity and the benign Boulware-Deser mode