Positive mass theorem for the Paneitz-Branson operator
  We prove that under suitable assumptions, the constant term in the Green function of the Paneitz-Branson operator on a compact Riemannian manifold $(M,g)$ is positive unless $(M,g)$ is conformally diffeomophic to the standard sphere. The proof is inspired by the positive mass theorem on spin manifolds by Ammann-Humbert. 
Emmanuel Humbert (IECN), Simon Raulot (UNINE)