Quantum unitary dynamics in cosmological spacetimes
Por:
Cortez J., Marugan, GAM, Velhinho J.M.
Publicada:
1 dic 2015
Categoría:
Physics and Astronomy (miscellaneous)
Resumen:
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. © 2015 Elsevier Inc.
Filiaciones:
Cortez J.:
Univ Nacl Autonoma Mexico, Dept Fis, Fac Ciencias, Mexico City 04510, DF, Mexico
Velhinho J.M.:
Departamento de Física, Faculdade de Ciências, Universidade da Beira Interior, R. Marquês D'Ávila e Bolama, Covilhã, 6201-001, Portugal
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