Non Pauli-Fierz Massive Gravitons

TL;DR

It is shown that, contrary to the standard lore, there exist consistent theories where the graviton mass term violates Pauli-Fierz structure and these types of mass terms are required by any consistent realization of the Dvali-Gabadadze-Porrati model in higher dimension.

Abstract

We study general Lorentz invariant theories of massive gravitons. We show that, contrary to the standard lore, there exist consistent theories where the graviton mass term violates Pauli-Fierz structure. For theories where the graviton is a resonance this does not imply the existence of a scalar ghost if the deviation from Pauli-Fierz becomes sufficiently small at high energies. These types of mass terms are required by any consistent realization of the DGP model in higher dimension.