Observer dependence in quantum cosmology

The main thesis of this paper is that minisuperspace quantum cosmology reproduces the observer dependence of the vacuum found in quantum field theory in curved spacetime. We show that the vacua picked up by the Hartle-Hawking "no boundary" proposal in two different minisuperspaces sharing...

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Autores principales: Calzetta, E., Kandus, A.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_05562821_v48_n8_p3906_Calzetta
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_05562821_v48_n8_p3906_Calzetta2023-10-03T15:35:27Z Observer dependence in quantum cosmology Calzetta, E. Kandus, A. The main thesis of this paper is that minisuperspace quantum cosmology reproduces the observer dependence of the vacuum found in quantum field theory in curved spacetime. We show that the vacua picked up by the Hartle-Hawking "no boundary" proposal in two different minisuperspaces sharing the same classical limit (k=0 and k=1 de Sitter minisuperspaces) are nonequivalent. A closer inspection suggests that the observer dependence is introduced through the choice of the Wick rotation. This hypothesis is supported by the analysis of the static de Sitter minisuperspace, where two different Euclidean sections are available, and where again two inequivalent vacua are obtained. These examples are not conclusive, but point to the possibility of a similar ambiguity even in full quantum cosmology. © 1993 The American Physical Society. Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kandus, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_05562821_v48_n8_p3906_Calzetta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The main thesis of this paper is that minisuperspace quantum cosmology reproduces the observer dependence of the vacuum found in quantum field theory in curved spacetime. We show that the vacua picked up by the Hartle-Hawking "no boundary" proposal in two different minisuperspaces sharing the same classical limit (k=0 and k=1 de Sitter minisuperspaces) are nonequivalent. A closer inspection suggests that the observer dependence is introduced through the choice of the Wick rotation. This hypothesis is supported by the analysis of the static de Sitter minisuperspace, where two different Euclidean sections are available, and where again two inequivalent vacua are obtained. These examples are not conclusive, but point to the possibility of a similar ambiguity even in full quantum cosmology. © 1993 The American Physical Society.
format JOUR
author Calzetta, E.
Kandus, A.
spellingShingle Calzetta, E.
Kandus, A.
Observer dependence in quantum cosmology
author_facet Calzetta, E.
Kandus, A.
author_sort Calzetta, E.
title Observer dependence in quantum cosmology
title_short Observer dependence in quantum cosmology
title_full Observer dependence in quantum cosmology
title_fullStr Observer dependence in quantum cosmology
title_full_unstemmed Observer dependence in quantum cosmology
title_sort observer dependence in quantum cosmology
url http://hdl.handle.net/20.500.12110/paper_05562821_v48_n8_p3906_Calzetta
work_keys_str_mv AT calzettae observerdependenceinquantumcosmology
AT kandusa observerdependenceinquantumcosmology
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