Abstract
At weak coupling the neighborhood of a E 6 Yukawa point in SU(5) GUT F-theory models is described by a non-resolvable orientifold of the conifold. We explicitly show, first directly in IIB and then via a mirror symmetry argument, that in this limit the E 6 Yukawa coupling is better described as coming from the non-perturbative contribution of a euclidean D1-brane wrapping the non-resolvable cycle. We also discuss how the M-theory description interpolates between the weak and strong coupling viewpoints.
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Collinucci, A., García-Etxebarria, I. E 6 Yukawa couplings in F-theory as D-brane instanton effects. J. High Energ. Phys. 2017, 155 (2017). https://doi.org/10.1007/JHEP03(2017)155
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DOI: https://doi.org/10.1007/JHEP03(2017)155