Towards multi-field D-brane inflation in a warped throat

TL;DR

This paper investigates the dynamics of D-brane inflation in warped throats, focusing on the transition from slow-roll to instability-driven phases involving multiple fields and angular modes.

Contribution

It provides a detailed analysis of both single-field and multi-field potentials, highlighting the role of angular instabilities in D-brane inflation models.

Findings

Angular instabilities develop during inflation.

Angular modes influence the end of slow-roll inflation.

Identification of vacua driven by angular instabilities.

Abstract

We study the inflationary dynamics in a model of slow-roll inflation in warped throat. Inflation is realized by the motion of a D-brane along the radial direction of the throat, and at later stages instabilities develop in the angular directions. We closely investigate both the single field potential relevant for the slow-roll phase, and the full multi-field one including the angular modes which becomes important at later stages. We study the main features of the instability process, discussing its possible consequences and identifying the vacua towards which the angular modes are driven.