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Title

Quantum unitary dynamics in cosmological spacetimes

AuthorsCortez, Jerónimo; Mena Marugán, Guillermo A. ; Velhinho, José M.
KeywordsCurved spacetime
Quantum field theory
Uniqueness criteria
Unitary dynamics
Issue Date25-Sep-2015
PublisherElsevier
CitationAnnals of Physics 363: 36- 47 (2015)
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.
Description12 pags.
Publisher version (URL)http://dx.doi.org/10.1016/j.aop.2015.09.016
URI10261/129617
DOI10.1016/j.aop.2015.09.016
Identifiersdoi: 10.1016/j.aop.2015.09.016
issn: 1096-035X
Appears in Collections:(CFMAC-IEM) Artículos
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