SciPost logo

Why are fractional charges of orientifolds compatible with Dirac quantization?

Yuji Tachikawa, Kazuya Yonekura

SciPost Phys. 7, 058 (2019) · published 1 November 2019

Abstract

Orientifold $p$-planes with $p\le4$ have fractional D$p$-charges, and therefore appear inconsistent with Dirac quantization with respect to D$(6-p)$-branes. We explain in detail how this issue is resolved by taking into account the anomaly of the worldvolume fermions using the $\eta$ 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 $GL(2,\mathbb{Z})$.

Cited by 35

Crossref Cited-by

Ontology / Topics

See full Ontology or Topics database.

Dirac points Topological phase transitions

Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.
Funders for the research work leading to this publication