### Abstract

Boundary conditions and the corresponding states of a quantum field theory depend on how the horizons are taken into account. There is an ambiguity as to which method is appropriate because different ways of incorporating the horizons lead to different results. We propose that a natural way of including the horizons is to first consider the Kruskal extension and then define the quantum field theory on the Euclidean section. Boundary conditions emerge naturally as consistency conditions of the Kruskal extension. We carry out the proposal for the explicit case of the Schwarzschild-de Sitter manifold with two horizons. The required period β is the interesting condition that it is the lowest common multiple of 2π divided by the surface gravity of both horizons. Restricting the ratio of the surface gravity of the horizons to rational numbers yields finite β. The example also highlights some of the difficulties of the off-shell approach with conical singularities in the multi-horizon scenario and serves to illustrate the much richer interplay that can occur among horizons, quantum field theory and topology when the cosmological constant is not neglected in black-hole processes.

Original language | English |
---|---|

Pages (from-to) | 551-562 |

Number of pages | 12 |

Journal | Classical and Quantum Gravity |

Volume | 16 |

Issue number | 2 |

DOIs | |

Publication status | Published - 1999 Feb 1 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

### Cite this

}

**Quantum field theory with and without conical singularities : Black holes with a cosmological constant and the multi-horizon scenario.** / Lin, Feng Li; Soo, Cho-Pin.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Quantum field theory with and without conical singularities

T2 - Black holes with a cosmological constant and the multi-horizon scenario

AU - Lin, Feng Li

AU - Soo, Cho-Pin

PY - 1999/2/1

Y1 - 1999/2/1

N2 - Boundary conditions and the corresponding states of a quantum field theory depend on how the horizons are taken into account. There is an ambiguity as to which method is appropriate because different ways of incorporating the horizons lead to different results. We propose that a natural way of including the horizons is to first consider the Kruskal extension and then define the quantum field theory on the Euclidean section. Boundary conditions emerge naturally as consistency conditions of the Kruskal extension. We carry out the proposal for the explicit case of the Schwarzschild-de Sitter manifold with two horizons. The required period β is the interesting condition that it is the lowest common multiple of 2π divided by the surface gravity of both horizons. Restricting the ratio of the surface gravity of the horizons to rational numbers yields finite β. The example also highlights some of the difficulties of the off-shell approach with conical singularities in the multi-horizon scenario and serves to illustrate the much richer interplay that can occur among horizons, quantum field theory and topology when the cosmological constant is not neglected in black-hole processes.

AB - Boundary conditions and the corresponding states of a quantum field theory depend on how the horizons are taken into account. There is an ambiguity as to which method is appropriate because different ways of incorporating the horizons lead to different results. We propose that a natural way of including the horizons is to first consider the Kruskal extension and then define the quantum field theory on the Euclidean section. Boundary conditions emerge naturally as consistency conditions of the Kruskal extension. We carry out the proposal for the explicit case of the Schwarzschild-de Sitter manifold with two horizons. The required period β is the interesting condition that it is the lowest common multiple of 2π divided by the surface gravity of both horizons. Restricting the ratio of the surface gravity of the horizons to rational numbers yields finite β. The example also highlights some of the difficulties of the off-shell approach with conical singularities in the multi-horizon scenario and serves to illustrate the much richer interplay that can occur among horizons, quantum field theory and topology when the cosmological constant is not neglected in black-hole processes.

UR - http://www.scopus.com/inward/record.url?scp=0033248169&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033248169&partnerID=8YFLogxK

U2 - 10.1088/0264-9381/16/2/017

DO - 10.1088/0264-9381/16/2/017

M3 - Article

VL - 16

SP - 551

EP - 562

JO - Classical and Quantum Gravity

JF - Classical and Quantum Gravity

SN - 0264-9381

IS - 2

ER -