On Gauge Threshold Corrections for Local IIB/F-theory GUTs

Details On Gauge Threshold Corrections for Local IIB/F-theory GUTs On Gauge Threshold Corrections for Local IIB/F-theory GUTs

2009-07-08

arxiv.org/abs/0907.1362v2

Physics

High Energy Physics

High Energy Physics - Theory

4 pages; v2. journal version

Scientific paper

We study gauge threshold corrections for local GUT models in IIB/F-theory. Consistency with holomorphy requirements of supergravity and the Kaplunovsky-Louis formula implies that the unification scale is enhanced by the bulk radius R from the string scale to M_X =RM_S. We argue that the stringy interpretation of this is via a locally uncancelled tadpole sourced by the hypercharge flux. This sources closed string modes propagating into the bulk; equivalently open string gauge coupling running up to the winding scale M_X. The enhancement to R M_s is tied to GUT breaking by a globally trivial hypercharge flux and will occur in all models realising this mechanism.

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