Black holes with surrounding matter in scalar-tensor theories.

@article{Cardoso2013BlackHW,
  title={Black holes with surrounding matter in scalar-tensor theories.},
  author={Vitor Cardoso and Isabella P Carucci and Paolo Pani and Thomas P. Sotiriou},
  journal={Physical review letters},
  year={2013},
  volume={111 11},
  pages={
          111101
        }
}
We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated with the presence of matter in the vicinity of the black hole and the fact that this introduces an effective mass for the scalar. Our results highlight the importance of understanding the structure of spacetime in realistic, astrophysical black holes in scalar-tensor theories. 

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