Consistency conditions for the five-brane in M-theory on R5Z2 orbifold Original Research Article

We derive some consistency conditions for the five-brane in M-theory on R5Z2 orbifold from the quantization law for the antisymmetric tensor field. We construct consistent five-brane configurations in R5Z2 type orbifold that exhibit the correct low energy dynamics of N = 2 SQCD in four dimensions with symplectic and orthogonal gauge groups. This leads us to propose the M-theory realization of orientifold four-planes of various types, and we study their properties by applying the consistency conditions.