Hypercharge flux in F-theory and the stable Sen limit

Understand

IIB compactifications enjoy the possibility to break GUT groups via fluxes without giving mass to the hypercharge gauge field.

• Although this important advantage has greatly motivated F-theory constructions, no such fluxes have been constructed directly in terms of the M-theory $G_4$-form.
• In this note, we give a general prescription for constructing hypercharge G-fluxes.
• By using a stable version of Sen's weak coupling limit, we verify their connection with IIB fluxes.