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dc.contributor.authorCortez, Jerónimo-
dc.contributor.authorMena Marugán, Guillermo A.-
dc.contributor.authorVelhinho, José M.-
dc.date.issued2015-09-25-
dc.identifierdoi: 10.1016/j.aop.2015.09.016-
dc.identifierissn: 1096-035X-
dc.identifier.citationAnnals of Physics 363: 36- 47 (2015)-
dc.identifier.uri10261/129617-
dc.description12 pags.-
dc.description.abstract© 2015 Elsevier Inc. We address the question of unitary implementation of the dynamics for scalar fields in cosmological scenarios. Together with invariance under spatial isometries, the requirement of a unitary evolution singles out a rescaling of the scalar field and a unitary equivalence class of Fock representations for the associated canonical commutation relations. Moreover, this criterion provides as well a privileged quantization for the unscaled field, even though the associated dynamics is not unitarily implementable in that case. We discuss the relation between the initial data that determine the Fock representations in the rescaled and unscaled descriptions, and clarify that the S-matrix is well defined in both cases. In our discussion, we also comment on a recently proposed generalized notion of unitary implementation of the dynamics, making clear the difference with the standard unitarity criterion and showing that the two approaches are not equivalent.-
dc.description.sponsorshipWe acknowledge financial aid from the research grants MICINN/MINECO FIS2011-30145-C03-02 and FIS2014-54800-C2-2-P from Spain, DGAPA-UNAM IN113115 and CONACyT 237351 from Mexico. JMV acknowledges COST Action MP1405 QSPACE, supported by COST (European Cooperation in Science and Technology)-
dc.publisherElsevier-
dc.relationMICINN/FIS2011-30145-C03-02-
dc.relationMINECO/FIS2014-54800-C2-2-P-
dc.relation.isversionofPreprint-
dc.rightsopenAccess-
dc.subjectCurved spacetime-
dc.subjectQuantum field theory-
dc.subjectUniqueness criteria-
dc.subjectUnitary dynamics-
dc.titleQuantum unitary dynamics in cosmological spacetimes-
dc.typepreprint-
dc.identifier.doi10.1016/j.aop.2015.09.016-
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.aop.2015.09.016-
dc.date.updated2016-03-01T12:22:52Z-
dc.description.versionPeer Reviewed-
dc.language.rfc3066eng-
dc.contributor.funderMinisterio de Ciencia e Innovación (España)-
dc.contributor.funderMinisterio de Economía y Competitividad (España)-
dc.contributor.funderConsejo Nacional de Ciencia y Tecnología (México)-
dc.contributor.funderEuropean Cooperation in Science and Technology-
dc.relation.csic-
dc.identifier.funderhttp://dx.doi.org/10.13039/501100004837es_ES
dc.identifier.funderhttp://dx.doi.org/10.13039/501100003329es_ES
dc.identifier.funderhttp://dx.doi.org/10.13039/501100003141es_ES
dc.identifier.funderhttp://dx.doi.org/10.13039/501100000921es_ES
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