Running Gauge Couplings and Thresholds in the Type II Superstring

Details Running Gauge Couplings and Thresholds in the Type II Superstring Running Gauge Couplings and Thresholds in the Type II Superstring

1992-05-26

arxiv.org/abs/hep-th/9205094v1

Nucl.Phys.B387:86-96,1992

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, IFP-432-UNC

Scientific paper

10.1016/0550-3213(92)90047-F

A distinctive feature of string unification is the possibility of unification by a non-simply-laced group. This occurs most naturally in four dimensional type~II string models where the gauge symmetry is realized by Kac-Moody algebras at different levels. We investigate the running coupling constants and the one-loop thresholds for such general models. As a specific case, we examine a $\rm SU(3)\times U(1)\times U(1)$ model and find that the threshold corrections lead to a small $6\%$ increase in the unification scale.

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