## Abstract

It is well known that non-perturbative α^{′} corrections to the SL(2, ℝ)/U(1) cigar geometry are described via a condensation of a Sine-Liouville operator that schematically can be written as W^{+} + W^{−}, where W^{±} describe a string with winding number ±1. This condensation leads to interesting effects in the cigar geometry that take place already at the classical level in string theory. Condensation of the analytically continued Sine-Liouville operator in the Lorentzian SL(2, ℝ)/U(1) black hole is problematic. Here, we propose that in the black hole case, the non-perturbative α^{′} corrections are described in terms of an operator that can be viewed as the analytic continuation of the fusion of W^{+} and W^{−}. We show that this operator does not suffer from the same problem as the analytically continued Sine-Liouville operator and argue that it describes folded strings that fill the entire black hole and, in a sense, replace the black hole interior. We estimate the folded strings radiation, and show that they radiate at the Hawking temperature.

Original language | American English |
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Article number | 14 |

Journal | Journal of High Energy Physics |

Volume | 2019 |

Issue number | 11 |

DOIs | |

State | Published - 1 Nov 2019 |

### Bibliographical note

Publisher Copyright:© 2019, The Author(s).

## Keywords

- 2D Gravity
- Black Holes
- Black Holes in String Theory