On Flux Quantization in F-Theory II: Unitary and Symplectic Gauge Groups

Details On Flux Quantization in F-Theory II: Unitary and Symplectic Gauge Groups On Flux Quantization in F-Theory II: Unitary and Symplectic Gauge Groups

2012-03-20

arxiv.org/abs/1203.4542v1

Physics

High Energy Physics

High Energy Physics - Theory

33 pages, 4 figures

Scientific paper

We study the quantization of the M-theory G-flux on elliptically fibered Calabi-Yau fourfolds with singularities giving rise to unitary and symplectic gauge groups. We seek and find its relation to the Freed-Witten quantization of worldvolume fluxes on 7-branes in type IIB orientifold compactifications on Calabi-Yau threefolds. By explicitly constructing the appropriate four-cycles on which to calculate the periods of the second Chern class of the fourfolds, we find that there is a half-integral shift in the quantization of G-flux whenever the corresponding dual 7-brane is wrapped on a non-spin submanifold. This correspondence of quantizations holds for all unitary and symplectic gauge groups, except for SU(3), which behaves mysteriously. We also perform our analysis in the case where, in addition to the aforementioned gauge groups, there is also a 'flavor' U(1)-gauge group.

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