Higher Derivative Theories for Interacting Massless Gravitons in   Minkowski Spacetime
  We study a novel class of higher derivative theories for interacting massless gravitons in Minkowski spacetime. These theories were first discussed by Wald decades ago, and are characterized by scattering amplitudes essentially different from general relativity and many of its modifications. We discuss various aspects of these higher derivative theories, including the Lagrangian construction, violation of asymptotic causality, scattering amplitudes, non-renormalization, and possible implications on emergent gravitons from condensed matter systems. 
Dong Bai, Yu-Hang Xing
hep-th cond-mat.str-el gr-qc