Unitarity in the presence of closed timelike curves

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Costa, MS (Author) FCUP

Journal

Title: Fortschritte der Physik

Vol. 54

Pages: 351-356

ISSN: 0015-8208

Publisher: Wiley-Blackwell

Indexing

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Other information

Authenticus ID: P-004-KXV

DOI: 10.1002/prop.200510281

Abstract (EN): We conjecture that, in certain cases, quantum dynamics is consistent in the presence of closed timelike curves. We consider time dependent orbifolds of three dimensional Minkowski space describing, in the limit of large AdS radius, BTZ black holes inside the horizon. Although perturbative unitarity fails, we show that, for discrete values of the gravitational coupling, particle propagation is consistent with unitarity. This quantization corresponds to the quantization of the black hole angular momentum. We perform the computation at very low energies, where string effects are irrelevant and interactions are dominated by graviton exchange in the eikonal regime. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6