Anomaly Cancellations in the Type I D9-anti-D9 System and the USp(32) String Theory

Abstract

We check some consistency conditions for the D9-anti-D9 system in type I string theory. The gravitational anomaly and gauge anomaly for SO(n) x SO(m) gauge symmetry are shown to be cancelled when n-m=32. In addition, we find that a string theory with USp(n) x USp(m) gauge symmetry also satisfies the anomaly cancellation conditions. After tachyon condensation, the theory reduces to a tachyon-free USp(32) string theory, though there is no spacetime supersymmetry.

17 pages + 10 eps figures, LaTeX; minor corrections, reference added, version to appear in Prog. Theor. Phys

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