Scattering of Gauge, Matter, and Moduli Fields from Intersecting Branes

TL;DR

This paper computes tree-level scattering amplitudes in string theory setups with intersecting branes, revealing how fluxes and moduli influence gauge couplings, matter metrics, and Yukawa couplings in effective models.

Contribution

It provides explicit calculations of scattering amplitudes and derives the moduli and flux dependence of gauge and matter field metrics in intersecting brane models.

Findings

Determined the moduli dependence of gauge couplings.

Derived the metrics for matter fields influenced by fluxes.

Calculated physical Yukawa couplings with proper normalization.

Abstract

We calculate various tree-level (disk) scattering amplitudes involving gauge, matter and moduli fields in type IIB toroidal orbifold/orientifold backgrounds with D9,D5 respectively D7,D3-branes or via T-duality D6-branes in type IIA compactifications. In type IIB the D-branes may have non-vanishing fluxes on their world-volume. From these results we extract the moduli and flux dependence of the tree-level gauge couplings, the metrics for the moduli and matter fields. The non-vanishing fluxes correspond in the T-dual type IIA description to intersecting D6-branes. This allows us to determine the moduli dependence of the tree-level matter field metrics in the effective action of intersecting D6-brane models. In addition we derive the physical Yukawa couplings with their correct normalization.