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

By Joseph P. Conlon and Eran Palti


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.Comment: 4 pages; v2. journal versio

Topics: High Energy Physics - Theory
Publisher: 'American Physical Society (APS)'
Year: 2010
DOI identifier: 10.1103/PhysRevD.80.106004
OAI identifier:

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