A note on non-flat points in the SU(5) × U(1)PQ F-theory model
A note on non-flat points in the SU(5) × U(1)PQ F-theory model
Non-flat fibrations often appear in F-theory GUT models, and their interpretation is still somewhat mysterious. In this note we explore this issue in a model of particular phenomenological interest, the global $SU(5)\times U(1)$ Peccei-Quinn F-theory model. We present evidence that co-dimension three non-flat fibres give rise to higher order couplings …