On the Entropy and the Density Matrix of Cosmological Perturbations

Details On the Entropy and the Density Matrix of Cosmological Perturbations On the Entropy and the Density Matrix of Cosmological Perturbations

1997-09-24

arxiv.org/abs/gr-qc/9709061v1

Class.Quant.Grav. 15 (1998) 1927-1936

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX2e with the epsf package

Scientific paper

10.1088/0264-9381/15/7/010

We look at the transition to the semiclassical behaviour and the decoherence process for the inhomogeneous perturbations in the inflationary universe. Two different decoherence mechanisms appear: one dynamical, accompanied with a negligible, if at all, entropy gain, and the other, effectively irreversible dephasing, due to a rapid variation in time of the off-diagonal density matrix elements in the post-inflationary epoch. We thus settle the discrepancies in the entropy content of perturbations evaluated by different authors.

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