Vacuum structure for expanding geometry

Details Vacuum structure for expanding geometry Vacuum structure for expanding geometry

1999-04-12

arxiv.org/abs/gr-qc/9904027v1

Class.Quant.Grav. 17 (2000) 93-111

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex file, epsfig, 1 figure, 21 pages

Scientific paper

10.1088/0264-9381/17/1/307

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.

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