Dynamics of D3-D7 Brane Inflation in Throats

TL;DR

This paper investigates the dynamics of D3-branes in warped D3-D7 inflation models, including perturbative and nonperturbative corrections, finding that a de Sitter minimum can be achieved without anti-branes but slow-roll inflation is hindered by potential steepness.

Contribution

It demonstrates the possibility of obtaining a de Sitter minimum without anti-branes in D3-D7 models with corrections, and analyzes the potential's steepness affecting inflation.

Findings

A dS minimum can be achieved without anti-branes.

The D3-D7 potential is too steep for slow-roll inflation.

D3-brane movement depends on D7-brane embedding and angular stabilization.

Abstract

Dynamics of D3-branes in models of warped D3-D7 inflationary set up is studied where perturbative $\alpha'$ correction to the K\"ahler potential and the nonperturbative corrections to the superpotential are included. It is shown that a dS minimum can be obtained without introducing anti-branes. Some specific configurations of D7-branes embedding were studied. After stabilizing the angular directions, it is shown that the resulting D3-D7 potential of the radial position of the D3-brane is too steep to allow slow-roll inflation. Depending on D7-branes embedding and the stabilized angular directions, the mobile D3-brane can move either towards the tip of the throat or towards the D7-branes.