Type IIB Orientifolds with NS-NS Antisymmetric Tensor Backgrounds

Details Type IIB Orientifolds with NS-NS Antisymmetric Tensor Backgrounds Type IIB Orientifolds with NS-NS Antisymmetric Tensor Backgrounds

1998-03-17

arxiv.org/abs/hep-th/9803141v3

Phys.Rev. D58 (1998) 086001

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, revtex, minor misprints corrected

Scientific paper

10.1103/PhysRevD.58.086001

We consider six dimensional N=1 space-time supersymmetric Type IIB orientifolds with non-zero untwisted NS-NS sector B-field. The B-field is quantized due to the requirement that the Type IIB spectrum be left-right symmetric. The presence of the B-field 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-field 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-field. These two facts are in accord with anomaly cancellation requirements. We point out relations between various orientifolds with and without the B-field, and also discuss the F-theory duals of these models.

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