Moduli stabilization from magnetic fluxes in type I string theory

TL;DR

This paper demonstrates that magnetic fluxes in type I string theory compactifications can stabilize all moduli while allowing their values to be tuned arbitrarily large, providing an exact string-based mechanism for moduli stabilization.

Contribution

It introduces a novel moduli stabilization method using magnetic fluxes in type I string theory with explicit examples and discusses its advantages over existing approaches.

Findings

All Kahler and complex structure moduli can be fixed.

Magnetic fluxes allow tuning of moduli to large values.

The mechanism is compatible with intersecting D-brane models.

Abstract

We show that type I string theory compactified in four dimensions in the presence of constant internal magnetic fields possesses N=1 supersymmetric vacua, in which all Kahler class and complex structure closed string moduli are fixed. Furthermore, their values can be made arbitrarily large by a suitable tuning of the quantized magnetic fluxes. We present an explicit example for the toroidal compactification on T^6 and discuss Calabi-Yau generalizations. This mechanism can be complementary to other stabilization methods using closed string fluxes but has the advantage of having an exact string description and thus a validity away from the low-energy supergravity approximation. Moreover, it can be easily implemented in constructions of string models based on intersecting D-branes.