Beyond the horizon

Journal Article · Mon May 15 00:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.73.104035· OSTI ID:20774720

Einhorn, Martin B ^[1]; Mahato, Manavendra ^[2]

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1. Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030 (United States)
2. Michigan Center for Theoretical Physics, Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)

Cosmic horizons arise in general relativity in the context of black holes and in certain cosmologies. Classically, regions beyond a horizon are inaccessible to causal observers. However, quantum mechanical correlations may exist across horizons that may influence local observations. For the case of de Sitter space, we show how a single particle excitation behind the horizon changes the density matrix governing local observables. As compared to the vacuum state, we calculate the change in the average energy and entropy per unit volume. This illustrates what may be a generic property allowing some features of spacetime beyond a horizon to be inferred.

• OSTI ID: 20774720
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 10; Other Information: DOI: 10.1103/PhysRevD.73.104035; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BLACK HOLES
CORRELATIONS
COSMOLOGY
DE SITTER GROUP
DENSITY MATRIX
ENTROPY
EXCITATION
GENERAL RELATIVITY THEORY
QUANTUM FIELD THEORY
QUANTUM MECHANICS
SPACE-TIME
VACUUM STATES