Spectrum of Curvature Perturbation of Multi-field Inflation with Small-Field Potential

Abstract

In this paper, we have studied the spectrum of curvature perturbation of multi-field inflation with general small-field potential. We assume that the isocurvature perturbation may be neglected, and by using the Sasaki-Stewart formalism, we found that the spectrum may be redder or bluer than of its corresponding single field. The result depends upon the values of fields and their effective masses at the horizon-crossing time. We discuss the relevant cases.

8 pages, no figure, to publish in JCAP

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Cited by in corpus (4)

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• Energy Transfer in Multi Field Inflation and Cosmological Perturbations
• On Number of Nflation Fields
• Non-gaussianity and Statistical Anisotropy in Cosmological Inflationary Models