Gravitational waves with torsion in 3D
  We study gravitational waves with torsion as exact vacuum solutions of three-dimensional gravity with propagating torsion. The new solutions are a natural generalization of the plane-fronted gravitational waves in general relativity with a cosmological constant, in the presence of matter. 
M. Blagojevi\'c and B. Cvetkovi\'c
gr-qc hep-th