Multi-Throat Brane Inflation

TL;DR

This paper proposes a more generic brane inflation model involving D3 and anti-D3-branes in multi-throat string compactifications, where inflation occurs without traditional slow-roll conditions due to warping effects.

Contribution

It introduces a novel brane inflation scenario with multiple throats, allowing inflation without slow-roll and incorporating large warping akin to the Randall-Sundrum model.

Findings

Inflation can be triggered by D3-branes exiting warped throats.

The model does not require slow-roll conditions.

Large warping is compatible with the inflationary scenario.

Abstract

We present a scenario where brane inflation arises more generically. We start with D3 and anti-D3-branes at the infrared ends of two different throats. This setup is a natural consequence of the assumption that in the beginning we have a multi-throat string compactification with many wandering anti-D3-branes. A long period of inflation is triggered when D3-branes slowly exit the highly warped infrared region, under a potential generically arising from the moduli stabilization. In this scenario, the usual slow-roll conditions are not required, and a large warping is allowed to incorporate the Randall-Sundrum model.