Threshold corrections in orbifold models and superstring unification of gauge interactions

Details Threshold corrections in orbifold models and superstring unification of gauge interactions Threshold corrections in orbifold models and superstring unification of gauge interactions

1995-06-27

arxiv.org/abs/hep-th/9506178v2

Phys.Rev.D53:3920-3941,1996

Physics

High Energy Physics

High Energy Physics - Theory

24 pages. 2 figures. Revised version: Several misprints corrected. Few minor additions.

Scientific paper

10.1103/PhysRevD.53.3920

The string one loop renormalization of the gauge coupling constants is examined in abelian orbifold models. The contributions to string threshold corrections independent of the compactification moduli fields are evaluated numerically for several representative examples of orbifold models. We consider cases with standard and non-standard embeddings as well as cases with discrete Wilson lines background fields which match reasonably well with low energy phenomenology. We examine one loop gauge coupling constants unification in a description incorporating the combined effects of moduli dependent and independent threshold corrections, an adjustable Kac-Moody level for the hypercharge group factor and a large mass threshold associated with an anomalous $U(1)$ mechanism.

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