Induced charges as probes of low energy effective theories

Abstract

We suggest that the correspondence between gauge theories strongly coupled in the infrared and their low energy effective theories may be probed by introducing topologically non-trivial background scalar fields. We argue that one loop expressions for the global charges induced in vacuum by these background fields are in some cases exact in the fundamental theory, and hence should be matched in the effective theory. These matching conditions are sometimes inequivalent to 't Hooft ones. A few examples of induced charge matching are presented.