On Perturbation Spectra of N-flation

TL;DR

This paper analyzes the perturbation spectra of N-flation models with power law potentials, showing that the scalar spectrum is typically redder than single-field inflation, aligning with recent numerical findings.

Contribution

It provides an analytical study of the adiabatic perturbation spectrum in N-flation with power law potentials, extending previous numerical results.

Findings

Scalar spectrum of N-flation is generally redder than single-field inflation.

Results are consistent with recent numerical investigations.

Analytical confirmation of spectral tilt in N-flation models.

Abstract

In this note we study the adiabatic perturbation spectrum of N-flation with power law potential. We show that the scalar spectrum of N-flation is generally redder than that of its corresponding single field. The result obtained for that with unequal massive fields is consistent with the recent numerical investigation of Kim and Liddle.