We consider non-supersymmetric large N orientifold field theories. Specifically, we discuss a gauge theory with a Dirac fermion in the antisymmetric tensor representation. We argue that, at large N and in a large part of its bosonic sector, this theory is nonperturbatively equivalent to N = 1 SYM, so that exact results established in the latter (parent) theory also hold in the daughter orientifold theory. In particular, the non-supersymmetric theory has an exactly calculable bifermion condensate, exactly degenerate parity doublets, and a vanishing cosmological constant (all this to leading order in 1/N).
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A.A. would like to thank O. Aharony, C. Angelantonj, O. Bergman, Y. Frishman, A. Hanany, R. Rabadan, E. Rabinovici, and Y. Shadmi for useful discussions. M.S. is grateful to A. Gorsky and D. Tong for numerous communications and discussions of the Z k orbifold theories. The work of M.S. is supported in part by DOE grant DE-FG02-94ER408.