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  The Unruh-deWitt Detector and the Vacuum in the General Boundary formalism

Banisch, R., Hellmann, F., & Rätzel, D. (2013). The Unruh-deWitt Detector and the Vacuum in the General Boundary formalism. Classical and quantum gravity, 30 (23): 235026. doi:10.1088/0264-9381/30/23/235026.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-F681-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-F682-B
Genre: Journal Article

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1205.1549.pdf (Preprint), 4KB
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 Creators:
Banisch, Ralf, Author
Hellmann, Frank1, Author              
Rätzel, Dennis2, Author              
Affiliations:
1Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24014              
2Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, escidoc:24014              

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Free keywords: High Energy Physics - Theory, hep-th
 Abstract: We discuss how to formulate a condition for choosing the vacuum state of a quantum scalar field on a timelike hyperplane in the general boundary formulation (GBF) using the coupling to an Unruh-DeWitt detector. We explicitly study the response of an Unruh-DeWitt detector for evanescent modes which occur naturally in quantum field theory in the presence of the equivalent of a dielectric boundary. We find that the physically correct vacuum state has to depend on the physical situation outside of the boundaries of the spacetime region considered. Thus it cannot be determined by general principles pertaining only to a subset of spacetime.

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 Dates: 2012-05-072013-10-312013
 Publication Status: Published in print
 Pages: Version as published in CQG
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1205.1549
DOI: 10.1088/0264-9381/30/23/235026
 Degree: -

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Title: Classical and quantum gravity
Source Genre: Journal
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Publ. Info: Bristol, U.K. : Institute of Physics
Pages: - Volume / Issue: 30 (23) Sequence Number: 235026 Start / End Page: - Identifier: ISSN: 0264-9381
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925513480_1