Decoherence from Isocurvature Perturbations in Inflation
arXiv:astro-ph/0612067 · doi:10.1088/1475-7516/2007/11/029
Abstract
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.
12 pages, 3 figures. Substantial revision and extension covering a wider range of mass ratios, both numerically and analytically. Discussion extended and improved. The main thesis of the paper has remained unchanged. To appear in JCAP
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