One-Loop Kahler Metric of D-Branes at Angles

TL;DR

This paper calculates one-loop string corrections to D-brane moduli metrics at angles, finding that localized intersection states do not contribute quantum corrections, contrary to expectations from supersymmetric nonrenormalization theorems.

Contribution

It demonstrates that quantum corrections from localized intersection states vanish, providing new insights into D-brane moduli space in string theory.

Findings

Localized intersection states do not contribute to one-loop corrections.

Bulk state contributions are known and differ from intersection contributions.

Quantum corrections vanish for D-branes at angles in toroidal orientifolds.

Abstract

We evaluate string one-loop contributions to the Kahler metric of D-brane moduli (positions and Wilson lines), in toroidal orientifolds with branes at angles. Contributions due to bulk states in the loop are known, so we focus on the contributions due to states localized at intersections of orientifold images. We show that these quantum corrections vanish. This does not follow from the usual nonrenormalization theorems of supersymmetric field theory.