Black holes in massive gravity

Understand

We review the black hole solutions of the ghost-free massive gravity theory and its bimetric extension and outline the main results on the stability of these solutions against small perturbations.

• Massive (bi)-gravity accommodates exact black hole solutions, analogous to those of General Relativity.
• In addition to these solutions, hairy black holes -- solutions with no correspondent in General Relativity -- have been found numerically, whose existence is a natural consequence of the absence of Birkhoff's theorem in these theories.
• The existence of extra propagating degrees of freedom, makes the stability properties of these black holes richer and more complex than those of General Relativity.