Unitarity in the presence of closed timelike curves

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Lorenzo Cornalba (Autor) Outra; Miguel S Costa (Autor) FCUP

Revista

Título: Physical Review D - Particles, Fields, Gravitation and Cosmology

Vol. 74

ISSN: 1550-7998

Editora: American Physical Society

Indexação

ISI Web of Knowledge - 2 Citações

Scopus - 2 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

ID Authenticus: P-004-HQD

DOI: 10.1103/physrevd.74.064024

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 anti-de Sitter (AdS) radius, Banados, Teitelboim, Zanelli (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, as expected from the dual conformal field theory (CFT) description. Note, however, that we recover this result by analyzing the physics inside the horizon and near the singularity. The space-time under consideration has no AdS boundary, and we are therefore not using any assumption regarding a possible dual formulation. We perform the computation at very low energies, where string effects are irrelevant and interactions are dominated by graviton exchange in the eikonal regime. We probe the noncausal structure of space-time to leading order, but work to all orders in the gravitational coupling.

Idioma: Inglês

Tipo (Avaliação Docente): Científica