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• W3027238500 abstract "The existing transformation from a relativistic real scalar field to a complex non-relativistic scalar field by Namjoo, Guth, and Kaiser is generalized from Minkowski space to a more general background metric. In that case the transformation is not purely algebraic any more but determined by a differential equation. We apply the generalized transformation to a real scalar with $phi^4$ interaction on an Friedmann-Lema^itre-Robertson-Walker cosmologically expanding background and calculate the resulting non-relativistic action up to second order in small parameters. We also show that the transformation can be interpreted as a Bogoliubov transformation between relativistic and non-relativistic creation and annihilation operators and comment on emerging symmetries in the non-relativistic theory." @default.
• W3027238500 created "2020-05-29" @default.
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• W3027238500 date "2020-08-31" @default.
• W3027238500 modified "2023-10-14" @default.
• W3027238500 title "Real scalar field, the nonrelativistic limit, and the cosmological expansion" @default.
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• W3027238500 doi "https://doi.org/10.1103/physrevd.102.036024" @default.
• W3027238500 hasPublicationYear "2020" @default.
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