Infrared-finite graviton two-point function in static de Sitter space
  We study quantum gravitational perturbations in the static patch of de Sitter space. In particular, we determine the symplectic inner product of these perturbations and use it to write down the graviton two-point function in the state analogous to the Bunch-Davies vacuum in a certain gauge. We find this two-point function to be infrared-finite and time-translation invariant. 
Rafael P. Bernar, Lu\'is C. B. Crispino, Atsushi Higuchi
gr-qc