Supersymmetry and the multi-instanton measure II. From N = 4 to N = 0 Original Research Article

Extending recent N = 1 and N = 2 results, we propose an explicit formula for the integration measure on the moduli space of charge-n ADHM multi-instantons in N = 4 supersymmetric SU(2) gauge theory. As a consistency check, we derive a renormalization group relation between the N = 4, N = 2, and N = 1 measures. We then use this relation to construct the purely bosonic (“N = 0”) measure as well, in the classical approximation in which the one-loop small-fluctuations determinants is not included.