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Gravitational couplings andZ2orientifolds

Authors
Journal
Nuclear Physics B
0550-3213
Publisher
Elsevier
Publication Date
Volume
523
Issue
3
Identifiers
DOI: 10.1016/s0550-3213(98)00155-2
Keywords
  • Particle Physics

Abstract

Abstract The interplay between gravitational couplings on branes and the occurrence of fractional flux in low-dimensional orientifolds is examined. It is argued that gravitational couplings need to be assigned not only to D-branes but also to orientifold planes. The fractional charges of the orientifold d-planes can be understood in terms of flux quantization of the d − 3 form potential and modified Bianchi identities. Detailed results are presented for the case of the type IIB orientifold on T 6/ Z 2, which is dual to F-theory on a complex 4-fold with terminal singularities.

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