Superrotations and black hole pair creation

@article{Strominger2017SuperrotationsAB,
  title={Superrotations and black hole pair creation},
  author={Andrew Strominger and Alexander Zhiboedov},
  journal={Classical and Quantum Gravity},
  year={2017},
  volume={34},
  pages={064002}
}
Recent work has shown that the symmetries of classical gravitational scattering in asymptotically flat spacetimes include, at the linearized level, infinitesimal superrotations. These act like Virasoro generators on the celestial sphere at null infinity. However, due to the singularities in these generators, the physical status of finite superrotations has remained unclear. Here we address this issue in the context of the breaking of a cosmic string via quantum black hole pair nucleation. This… 
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