Analytic solutions in non-linear massive gravity
  We study spherically symmetric solutions in a covariant massive gravity model, which is a candidate for a ghost-free non-linear completion of the Fierz-Pauli theory. There is a branch of solutions that exhibits the Vainshtein mechanism, recovering General Relativity below a Vainshtein radius given by $(r_g m^2)^{1/3}$, where $m$ is the graviton mass and $r_g$ is the Schwarzschild radius of a matter source. Another branch of exact solutions exists, corresponding to Schwarzschild-de Sitter spacetimes where the curvature scale of de Sitter space is proportional to the mass squared of the graviton. 
Kazuya Koyama (ICG, Portsmouth), Gustavo Niz (ICG, Portsmouth),   Gianmassimo Tasinato (ICG, Portsmouth)
hep-th astro-ph.CO gr-qc hep-ph