Open String Moduli in KKLT Compactifications

TL;DR

This paper studies the open string moduli related to anti-D3-branes in KKLT de-Sitter compactifications, showing they are very light and proposing a method to increase their mass using orientifold planes.

Contribution

It identifies the lightness of open string moduli in KKLT setups and proposes a novel approach to stabilize them by incorporating orientifold planes.

Findings

Open string moduli are very light in KKLT constructions.

Introducing orientifold planes can increase the mass of these moduli.

Potential implications for stability and phenomenology of string compactifications.

Abstract

In the Kachru-Kallosh-Linde-Trivedi (KKLT) de-Sitter construction one introduces an anti-D3-brane that breaks the supersymmetry and leads to a positive cosmological constant. In this paper we investigate the open string moduli associated with this anti-D3-brane, corresponding to its position on the 3-sphere at the tip of the deformed conifold. We show that in the KKLT construction these moduli are very light, and we suggest a possible way to give these moduli a large mass by putting orientifold planes in the KKLT "throat".