Remarks on Global Anomalies in RCFT Orientifolds

TL;DR

This paper investigates global anomalies in supersymmetric standard model orientifold spectra using probe branes, revealing that anomaly absence often aligns with tadpole cancellation conditions, thus constraining model consistency.

Contribution

It provides a systematic check for global anomalies in orientifold spectra and shows their relation to tadpole cancellation, offering new consistency criteria for model building.

Findings

Global anomalies impose strong constraints on spectra.

Most solutions automatically satisfy anomaly cancellation due to tadpole conditions.

The analysis helps identify consistent supersymmetric orientifold models.

Abstract

We check the list of supersymmetric standard model orientifold spectra of Dijkstra, Huiszoon and Schellekens for the presence of global anomalies, using probe branes. Absence of global anomalies is found to impose strong constraints, but in nearly all cases they are automatically satisfied by the solutions to the tadpole cancellation conditions.