Instantons on Quivers and Orientifolds

Francesco Fucito, Jose F. Morales, Rubik Poghossian

Published 2004-08-11, updated 2004-08-13Version 2

We compute the prepotential for gauge theories descending from ${\cal N}=4$ SYM via quiver projections and mass deformations. This accounts for gauge theories with product gauge groups and bifundamental matter. The case of massive orientifold gauge theories with gauge group SO/Sp is also described. In the case with no gravitational corrections the results are shown to be in agreement with Seiberg-Witten analysis and previous results in the literature.