Gauge Threshold Corrections for Local String Models

Abstract

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.

30 pages; v2: references added, minor typos corrected

References in corpus (3)

• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Thresholds for Intersecting D-branes Revisited
• Two-Point Functions of Chiral Fields at One Loop in Type II

Cited by in corpus (2)

• SUSY Breaking in Local String/F-Theory Models
• Gauge Threshold Corrections for Local Orientifolds