Exact plane gravitational waves in the de Rham-Gabadadze-Tolley model of   massive gravity
  We show that the nonlinear massive gravity model of de Rham, Gabadadze, and Tolley admits exact plane gravitational wave solution whose waveform obeys the two-dimensional Helmholtz equation. The solution is valid for arbitrary values of the coefficients of the cubic and quartic terms. In the massless limit the solution reduces to the Aichelburg-Sexl metric in general relativity. 
Morteza Mohseni
hep-th gr-qc