Decoherence from Isocurvature Perturbations in Inflation

Details Decoherence from Isocurvature Perturbations in Inflation Decoherence from Isocurvature Perturbations in Inflation

2006-12-04

arxiv.org/abs/astro-ph/0612067v2

JCAP 0711:029,2007

Astronomy and Astrophysics

Astrophysics

12 pages, 3 figures. Substantial revision and extension covering a wider range of mass ratios, both numerically and analytical

Scientific paper

10.1088/1475-7516/2007/11/029

We discuss the possible role of isocurvature perturbations for the quantum decoherence of the curvature perturbation during inflation. We point out that if the inflaton trajectory in field space is curved, the adiabatic mode is generically coupled to the isocurvature mode and thus tracing out the latter can cause the curvature perturbation to decohere. We explicitly investigate this suggestion in a model of inflation with two decoupled massive fields and find that decoherence is effective for a wide range of mass ratios. In particular, we calculate the entanglement entropy for this model and show that it grows after horizon exit, providing a quantitative measure for decoherence.

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