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


We check some consistency conditions for the D9-D9 system in type I string theory. The gravitational anomaly and gauge anomaly for SO(n)×SO(m) gauge symmetry are shown to be cancelled when n − m = 32. In addition, we find that a string theory with USp(n) × USp(m) gauge symmetry also satisfies the anomaly cancellation conditions. After tachyon condensation… (More)


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