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Decoherence from Isocurvature Perturbations in Inflation

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arxiv astro-ph/0612067 v2 pith:EI3NZVAG submitted 2006-12-04 astro-ph hep-thquant-ph

Decoherence from Isocurvature Perturbations in Inflation

Tomislav Prokopec , Gerasimos I. Rigopoulos (Utrecht University) This is my paper
classification astro-ph hep-thquant-ph
keywords decoherenceinflationisocurvaturecurvaturemodemodelperturbationperturbations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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