Testing the nature of dark compact objects: a status report

@article{Cardoso2019TestingTN,
  title={Testing the nature of dark compact objects: a status report},
  author={Vitor Cardoso and Paolo Pani},
  journal={Living Reviews in Relativity},
  year={2019},
  volume={22},
  pages={1-104}
}
Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. The standard astrophysical description of collapsing objects tells us that massive, dark and compact objects are black holes. Any observation suggesting otherwise would be an indication of beyond-the-standard-model physics. Null results… 
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