One-loop corrections to the curvature perturbation from inflation

Details One-loop corrections to the curvature perturbation from inflation One-loop corrections to the curvature perturbation from inflation

2007-07-23

arxiv.org/abs/0707.3378v3

JCAP 0802:006,2008

Astronomy and Astrophysics

Astrophysics

28 pages, uses feynmp.sty and ioplatex journal style. v2: supersedes version published in JCAP. Some corrections and refinemen

Scientific paper

10.1088/1475-7516/2008/02/006

An estimate of the one-loop correction to the power spectrum of the primordial curvature perturbation is given, assuming it is generated during a phase of single-field, slow-roll inflation. The loop correction splits into two parts, which can be calculated separately: a purely quantum-mechanical contribution which is generated from the interference among quantized field modes around the time when they cross the horizon, and a classical contribution which comes from integrating the effect of field modes which have already passed far beyond the horizon. The loop correction contains logarithms which may invalidate the use of naive perturbation theory for cosmic microwave background (CMB) predictions when the scale associated with the CMB is exponentially different from the scale at which the fundamental theory which governs inflation is formulated.

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