he p - th / 9 80 31 41 v 2 8 M ay 1 99 8 CLNS 98 / 1550 , HUTP - 97 /

نویسندگان

  • Gary Shiu
  • S. - H. Henry Tye
چکیده

We consider six dimensional N = 1 space-time supersymmetric Type IIB orientifolds with non-zero untwisted NS-NS sector B-eld. The B-eld is quantized due to the requirement that the Type IIB spectrum be left-right symmetric. The presence of the B-eld results in rank reduction of both 99 and 55 open string sector gauge groups. We point out that in some of the models with non-zero B-eld there are extra tensor multiplets in the Z 2 twisted closed string sector, and we explain their origin in a simple example. Also, the 59 open string sector states come with a multiplicity that depends on the B-eld. These two facts are in accord with anomaly cancellation requirements. We point out relations between various orientifolds with and without the B-eld, and also discuss the F-theory duals of these models.

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تاریخ انتشار 1998