Brane world effective actions for D-branes with fluxes

TL;DR

This paper develops string-based techniques to derive effective actions for magnetized D-branes, analyzing moduli dependence, supersymmetry breaking, and the role of the Kahler metric in Yukawa couplings.

Contribution

It provides a systematic derivation of brane world effective actions with fluxes, including moduli dependence and supersymmetry breaking mechanisms, within a string theory framework.

Findings

Derived kinetic terms dependence on NS-NS moduli.

Identified Kahler metric as normalization of scalar kinetic terms.

Discussed D and F term breaking mechanisms in string context.

Abstract

We develop systematic string techniques to study brane world effective actions for models with magnetized (or equivalently intersecting) D-branes. In particular, we derive the dependence on all NS-NS moduli of the kinetic terms of the chiral matter in a generic non-supersymmetric brane configurations with non-commuting open string fluxes. Near a N=1 supersymmetric point the effective action is consistent with a Fayet-Iliopoulos supersymmetry breaking and the normalization of the scalar kinetic terms is nothing else than the Kahler metric. We also discuss, from a stringy perspective, D and F term breaking mechanisms, and how, in this generic set up, the Kahler metric enters in the physical Yukawa couplings.