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

We check some consistency conditions for the D9-D<ovl>9</ovl> system in type I string theory. The gravitational anomaly and gauge anomaly for <it>SO</it>(<it>n</it>) × <it>SO</it>(<it>m</it>) gauge symmetry are shown to be cancelled when <it>n</it> − <it>m</it> = 32. In addition, we find that a stri... View More