New Massive Gravity on de Sitter Space and Black Holes at the Special   Point
  We study New Massive Gravity on de Sitter background and discuss several interrelated properties: The appearance of an enhanced symmetry point at linearized level where the theory becomes partially massless; its absence at full nonlinear level, and its relation with the existence of static black hole solutions and their hair parameter. 
Gregory Gabadadze, Gaston Giribet, Alberto Iglesias
hep-th gr-qc