Soft Hair on Black Holes.

@article{Hawking2016SoftHO,
  title={Soft Hair on Black Holes.},
  author={Stephen William Hawking and Malcolm Perry and Andrew Strominger},
  journal={Physical review letters},
  year={2016},
  volume={116 23},
  pages={
          231301
        }
}
It has recently been shown that Bondi-van der Burg-Metzner-Sachs supertranslation symmetries imply an infinite number of conservation laws for all gravitational theories in asymptotically Minkowskian spacetimes. These laws require black holes to carry a large amount of soft (i.e., zero-energy) supertranslation hair. The presence of a Maxwell field similarly implies soft electric hair. This Letter gives an explicit description of soft hair in terms of soft gravitons or photons on the black hole… 

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