Gauge Threshold Corrections for Local String Models

Details Gauge Threshold Corrections for Local String Models Gauge Threshold Corrections for Local String Models

2009-01-28

arxiv.org/abs/0901.4350v2

JHEP 0904:059,2009

Physics

High Energy Physics

High Energy Physics - Theory

30 pages; v2: references added, minor typos corrected

Scientific paper

10.1088/1126-6708/2009/04/059

We study gauge threshold corrections for local brane models embedded in a large compact space. A large bulk volume gives important contributions to the Konishi and super-Weyl anomalies and the effective field theory analysis implies the unification scale should be enhanced in a model-independent way from M_s to R M_s. For local D3/D3 models this result is supported by the explicit string computations. In this case the scale R M_s comes from the necessity of global cancellation of RR tadpoles sourced by the local model. We also study D3/D7 models and discuss discrepancies with the effective field theory analysis. We comment on phenomenological implications for gauge coupling unification and for the GUT scale.

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