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Man on the moon: The case for unitary dynamics

AuthorsMena Marugán, Guillermo A. ; Cortez, J.; Velhinho, J. M.
Issue Date25-May-2016
Citation8th Jerte Advanced Relativity Meeting (2016)
AbstractQuantum field theory is plagued with ambiguities, even for the Fock quantization of linear fields. There are infinite non-equivalent Fock representations of the Weyl algebra for fields. In stationary or highly symmetric spacetimes, there exist uniqueness criteria for the choice of a (unitary class of) representation(s). Recently, a criterion has been suggested to attain uniqueness also in non-stationary backgrounds, like in cosmological spacetimes The criterion is the vacuum invariance under the symmetries of the field equations, together with the unitary implementability of the dynamics. This criterion picks out a privileged parametrization of the field canonical pair, including rescalings, and fixes a family of unitarily equivalent representations for this pair. It has been successfully applied in FLRW and in Gowdy (anisotropic) spacetimes, for scalar fields and for fermions. Alternatively, a generalized notion of unitarity has been proposed to alleviate the tension that only one field parametrization admits a unitary evolution. We explain why, in our opinion, this tension is artifici
DescriptionPresentación de 26 págs.; Eigth Jerte Advanced Relativity and Related Analogs in Matter Physics, Loop Approaches and Symmetries; Navaconcejo, Cáceres (España); 23-26 de mayo de 2016
Appears in Collections:(CFMAC-IEM) Comunicaciones congresos
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