## Abstract

A quantization of (2 + 1)-dimensional gravity with negative cosmological constant is presented, and it is used to study quantum aspects of (2 + 1)-dimensional black holes. The quantization consists of two procedures. One is related with quantization of the asymptotic Virasoro symmetry. The concept of the Virasoro deformation of 3-geometry is introduced. For a given black hole, the deformation of the exterior of the outer horizon is identified with a product of the appropriate coadjoint orbits of the Virasoro groups diffS^{1}_{±}. Its quantization provides unitary irreducible representations of the Virasoro algebra, in which the state of the black hole becomes primary. To make the quantization complete, holonomies, the global degrees of freedom, are taken into account. By an identification of these topological operators with zero modes of the Liouville field, the aforementioned unitary representations are shown, as long as c ≫ 1, to be the Hilbert space of this two-dimensional conformal field theory. This conformal field theory, living on the cylinder at infinity of the black hole and having continuous spectra, can recognize the outer horizon only as a one-dimensional object in SL_{2}(R) and realize it as insertions of the corresponding vertex operator. Therefore it cannot be a conformal field theory on the horizon. Two possible descriptions of the horizon conformal field theory are proposed.

Original language | English |
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Pages (from-to) | 867-896 |

Number of pages | 30 |

Journal | Progress of Theoretical Physics |

Volume | 102 |

Issue number | 4 |

DOIs | |

Publication status | Published - 1999 Oct |

Externally published | Yes |

## ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)