## Abstract

String theory on 2-d charged black holes corresponding to SL(2) × U(1)L/U(1) exact asymmetric quotient CFTs are investigated. These backgrounds can be embedded, in particular, in a two dimensional heterotic string. In the extremal case, the quotient CFT description captures the near horizon physics, and is equivalent to strings in AdS_{2} with a gauge field. Such string vacua possess an infinite space-time Virasoro symmetry, and hence enhancement of global space-time Lie symmetries to affine symmetries, in agreement with the conjectured AdS_{2}/CFT_{1} correspondence. We argue that the entropy of these 2-d black holes in string theory is compatible with semi-classical results, and show that in perturbative computations part of an incoming flux is absorbed by the black hole. Moreover, on the way we find evidence that the 2-d heterotic string is closely related to the N = (2, 1) string, and conjecture that they are dual [3].

Original language | English |
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Pages (from-to) | 1599-1619 |

Number of pages | 21 |

Journal | Journal of High Energy Physics |

Issue number | 2 |

DOIs | |

State | Published - Feb 2005 |

Externally published | Yes |

## Keywords

- AdS-CFT and dS-CFT Correspondence
- Black Holes in String Theory
- Conformal Field Models in String Theory
- Superstrings and Heterotic Strings