N-flation in Supergravity

TL;DR

This paper develops an N-flation model within supergravity where multiple fields collectively drive inflation, each with sub-Planckian values, and the model's predictions resemble those of chaotic inflation.

Contribution

It introduces a supergravity-based N-flation model with multiple fields, generalizing single-field chaotic inflation and maintaining effective single-field dynamics.

Findings

Model achieves large-field inflation with sub-Planckian field values.

Predictions for tensor-to-scalar ratio and spectral index match chaotic inflation.

Dynamics can be effectively described by a single field despite interactions.

Abstract

We have constructed a large field N-flation model in the supergravity framework. In this simple set-up, N fields collectively drive inflation where each field traverses sub-Planckian field values. This has been realised with a generalisation of the single field chaotic inflation in Supergravity. Interestingly, despite of the presence of the field interactions, the dynamics can be described in terms of an effective single field. The observable predictions of our model i.e. tensor to scalar ratio r and scalar spectral index n_s are akin to the chaotic inflation.