Orientifold 4-plane in brane configurations and N = 4 USp(2Nc) and SO(Nc) theory Original Research Article

We consider brane configurations in elliptic models representing softly broken N = 4 USp (2Nc) and SO(Nc) theory. We generalize the notion of the O4-plane, so that it is compatible with the symmetry in the covering space of the elliptic models. By using this notion of the O4 plane, we find the curve for softly broken N = 4 USp(2Nc) and that for SO(Nc) theory as infinite series expansions. For the USp case, we can present the expansion as a polynomial.