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- W2032298051 abstract "We consider gravitational wave modes in the FRW metrics in a de Sitter phase and show that the state space splits into many unitarily inequivalent representations of the canonical commutation relations. Non-unitary time evolution is described as a trajectory in the space of the representations. The generator of time evolution is related to the entropy operator. The thermodynamic arrow of time is shown to point in the same direction of the cosmological arrow of time. The vacuum is a two-mode SU(1,1) squeezed state of thermo field dynamics. The link between expanding geometry, squeezing and thermal properties is exhibited." @default.
- W2032298051 created "2016-06-24" @default.
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- W2032298051 date "1999-11-30" @default.
- W2032298051 modified "2023-10-08" @default.
- W2032298051 title "Vacuum structure for expanding geometry" @default.
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- W2032298051 doi "https://doi.org/10.1088/0264-9381/17/1/307" @default.
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