D-branes and fractional instantons on a twisted four torus: the moduli space as an N=2 supersymmetric Higgs branch

Erich Poppitz

We study self-dual instantons of topological charge $Q=r/N$, for any natural $r$, in $SU(N)$ Yang-Mills theory on a four torus with 't Hooft twists, by embedding them into worldvol…