Curvaton mechanism after multi-field inflation

TL;DR

This paper investigates how the curvature perturbation evolves after multi-field inflation through the curvaton mechanism, explaining the underlying process and demonstrating its occurrence in simple two-field models, with implications for non-Gaussianity.

Contribution

It clarifies the mechanism behind curvature perturbation evolution post-inflation and shows its realization in two-field inflation models, advancing understanding of non-Gaussianity generation.

Findings

Evolution of curvature perturbation is significant after multi-field inflation.

The mechanism is demonstrated in a typical two-field inflation model.

Non-Gaussianity can be generated during this evolution.

Abstract

The evolution of the curvature perturbation after multi-field inflation is studied in the light of the curvaton mechanism. Past numerical studies show that many-field inflation causes significant evolution of the curvature perturbation after inflation, which generates significant non-Gaussianity at the same time. We reveal the underlying mechanism of the evolution and show that the evolution is possible in a typical two-field inflation model.