A physical characterization of the adiabatic vacuum in Robertson-Walker universe

As the red shift shows no sign of oscillatory behavior in an expanding universe we postulate that the energy ωk of a scalar field does not oscillate in such a universe. In the massive case, expanding the differential equation for ωk in mass powers, we find that the nonoscillatory solution coincides...

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Autores principales: Castagnino, Mario Alberto G. J., Chimento, Luis Pascual
Publicado: 1986
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v18_n2_p193_Castagnino
http://hdl.handle.net/20.500.12110/paper_00017701_v18_n2_p193_Castagnino
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00017701_v18_n2_p193_Castagnino
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spelling paper:paper_00017701_v18_n2_p193_Castagnino2023-06-08T14:21:28Z A physical characterization of the adiabatic vacuum in Robertson-Walker universe Castagnino, Mario Alberto G. J. Chimento, Luis Pascual As the red shift shows no sign of oscillatory behavior in an expanding universe we postulate that the energy ωk of a scalar field does not oscillate in such a universe. In the massive case, expanding the differential equation for ωk in mass powers, we find that the nonoscillatory solution coincides with the adiabatic solution up to the m6 order. We also demonstrate that this solution is unique for all the evolution of the universe with cosmological interest. Using the nonoscillatory solution as the one that defines the good vacuum state, we compute the particle and energy creation for a simple model of expanding universe. Both quantities turn out to be finite. © 1986 Plenum Publishing Corporation. Fil:Castagnino, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Chimento, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1986 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v18_n2_p193_Castagnino http://hdl.handle.net/20.500.12110/paper_00017701_v18_n2_p193_Castagnino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description As the red shift shows no sign of oscillatory behavior in an expanding universe we postulate that the energy ωk of a scalar field does not oscillate in such a universe. In the massive case, expanding the differential equation for ωk in mass powers, we find that the nonoscillatory solution coincides with the adiabatic solution up to the m6 order. We also demonstrate that this solution is unique for all the evolution of the universe with cosmological interest. Using the nonoscillatory solution as the one that defines the good vacuum state, we compute the particle and energy creation for a simple model of expanding universe. Both quantities turn out to be finite. © 1986 Plenum Publishing Corporation.
author Castagnino, Mario Alberto G. J.
Chimento, Luis Pascual
spellingShingle Castagnino, Mario Alberto G. J.
Chimento, Luis Pascual
A physical characterization of the adiabatic vacuum in Robertson-Walker universe
author_facet Castagnino, Mario Alberto G. J.
Chimento, Luis Pascual
author_sort Castagnino, Mario Alberto G. J.
title A physical characterization of the adiabatic vacuum in Robertson-Walker universe
title_short A physical characterization of the adiabatic vacuum in Robertson-Walker universe
title_full A physical characterization of the adiabatic vacuum in Robertson-Walker universe
title_fullStr A physical characterization of the adiabatic vacuum in Robertson-Walker universe
title_full_unstemmed A physical characterization of the adiabatic vacuum in Robertson-Walker universe
title_sort physical characterization of the adiabatic vacuum in robertson-walker universe
publishDate 1986
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00017701_v18_n2_p193_Castagnino
http://hdl.handle.net/20.500.12110/paper_00017701_v18_n2_p193_Castagnino
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