Why are fractional charges of orientifolds compatible with Dirac quantization?
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Orientifold pp-planes with p\le 4p≤4 have fractional Dpp-charges, and therefore appear inconsistent with Dirac quantization with respect to D(6{-}p)(6−p)-branes. We explain in detail how this issue is resolved by taking into account the anomaly of the worldvolume fermions using the \etaη invariants. We also point out relationships to the classification of interacting fermionic symmetry protected topological phases. In an appendix, we point out that the duality group of type IIB string theory is the pin^++ version of the double cover of GL(2,Z).
2019 ◽
Vol 368
(3)
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pp. 1121-1173
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2018 ◽
Vol 51
(44)
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pp. 445001
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