Superstrings in 2D backgrounds with R-R flux and new extremal black holes

@article{Berkovits2001SuperstringsI2,
  title={Superstrings in 2D backgrounds with R-R flux and new extremal black holes},
  author={Nathan Berkovits and Sergei Gukov and Brenno C. Vallilo},
  journal={Nuclear Physics},
  year={2001},
  volume={614},
  pages={195-232}
}
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TLDR
A large class of modifications of the standard Lagrangian for two-dimensional dilaton gravity have extremal solutions which are nonsingular analogues of the extremal Reissner-Nordstr\"om spacetime, and it is possible that quantum deformations of these extremal solution are the end point of Hawking evaporation when the models are coupled to matter.
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