Axion Stabilization in Type IIB Flux Compactifications

TL;DR

This paper explores the stabilization of axionic moduli in type IIB flux compactifications, incorporating perturbative and nonperturbative effects, and discusses potential influences of worldsheet instantons on the process.

Contribution

It extends existing models by including B_2 and C_2-moduli stabilization through perturbative and nonperturbative effects in type IIB flux compactifications.

Findings

Axions can be stabilized at tree level and with corrections.

Perturbative mma'-corrections aid in stabilization.

Nonperturbative D3-instanton effects contribute to stabilization.

Abstract

A scenario for stabilization of axionic moduli fields in the context of type IIB Calabi-Yau flux compactifications is discussed in detail. We consider the case of a Calabi-Yau orientifold with h^{1,1}_- \neq 0 which allows for the presence of B_2 and C_2-moduli. In an attempt to generalize the KKLT and the Large Volume Scenario, we show that these axions can also be stabilized - some already at tree level, and others when we include perturbative \alpha'-corrections to the Kaehler potential K and nonperturbative D3-instanton contributions to the superpotential W. At last, we comment on the possible influence of worldsheet instantons on the process of moduli stabilization.