Freed-Witten anomaly and D-brane gauge theories

TL;DR

This paper explores how the Freed-Witten anomaly influences the gauge theories on D-branes in type II superstring theory, emphasizing the need for a geometric framework involving gerbes and hypercohomology to fully understand the gauge fields.

Contribution

It provides a comprehensive geometric description of D-brane gauge theories considering the Freed-Witten anomaly, extending beyond the standard A-field as a connection on a vector bundle.

Findings

The Freed-Witten anomaly constrains the gauge fields on D-branes.

A joint geometric description of A-field and B-field is necessary.

Different gauge theories arise depending on anomaly considerations.

Abstract

We discuss the different nature of the gauge theories on a D-brane or a stack of D-branes, in type II superstring theory, as follows from the Freed-Witten anomaly. Usually on a D-brane world-volume there is a standard gauge theory, described by the A-field thought of as a connection on a complex vector bundle. Actually, this is a particular case, even if it is the most common one. In order to get a complete picture, within the framework provided by the geometry of gerbes with connection, it is necessary to give a joint geometrical description of the A-field and the B-field, via the language of Cech hypercohomology. The Freed-Witten anomaly, which is a global world-sheet anomaly, imposes some constraints on such fields: we will show for each case what is the nature of the corresponding gauge theory on the D-brane or stack of D-branes.