One-loop and D-instanton corrections to the effective action of open string models

TL;DR

This paper computes one-loop and D-instanton corrections to gauge couplings and superpotentials in D-brane string models, introducing poly-instantons and rederiving known superpotentials within string theory.

Contribution

It provides a method to determine D-instanton corrections and introduces the concept of poly-instantons in string theory models.

Findings

Computed one-loop gauge coupling corrections in D-brane models

Rederived the Affleck-Dine-Seiberg superpotential in string theory

Proposed the existence of multi-instanton poly-instantons

Abstract

One-loop corrections to the gauge coupling and the gauge kinetic function in certain classes of four-dimensional D-brane models are computed. It is described how to determine D-instanton corrections to the superpotential and the gauge kinetic function in such models. The Affleck-Dine-Seiberg superpotential is rederived in string theory. The existence of a new class of multi-instantons, dubbed poly-instantons, is conjectured.