Journal
PHYSICAL REVIEW D
Volume 101, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.101.106017
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Funding
- MEXT KAKENHI [JP19H04605]
- JSPS KAKENHI [JP19J00664, JP20K14477]
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We classify discrete modular symmetries in the effective action of Type IIB string on toroidal orientifolds with three-form fluxes, emphasizing on T-6/ Z(2) and T-6/(Z(2) x Z'(2)) orientifold backgrounds. In the three-form flux background, the modular group is spontaneously broken down to its congruence subgroup whose pattern is severely constrained by a quantization of fluxes and tadpole cancellation conditions. We explicitly demonstrate that the congruence subgroups appearing in the effective action arise on magnetized D-branes wrapping certain cycles of tori.
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