N-flation from multiple DBI type actions

TL;DR

This paper introduces a novel N-flation model utilizing multiple scalar fields, each with its own DBI action, leading to different inflationary dynamics compared to traditional models.

Contribution

It develops a new multi-DBI scalar field inflation model, distinct from existing N-flation and single-DBI models, with unique dependence on the number of fields.

Findings

Dependence of e-folding number on the number of fields differs from standard N-flation.

Curvature perturbation behavior is altered in the new model.

Specific examples demonstrate the model's characteristics.

Abstract

In this letter we present a new N-flation model constructed by making use of multiple scalar fields which are being described by their own DBI action. We show that the dependence of the e-folding number and of the curvature perturbation on the number of fields changes compared with the normal N-flation model. Our model is also quite different from the usual DBI N-flation which is still based on one DBI action but involves many moduli components. Some specific examples of our model have been analyzed.