String-Unification, Universal One-Loop Corrections and Strongly Coupled Heterotic String Theory

Details String-Unification, Universal One-Loop Corrections and Strongly Coupled Heterotic String Theory String-Unification, Universal One-Loop Corrections and Strongly Coupled Heterotic String Theory

1997-02-13

arxiv.org/abs/hep-th/9702110v2

Nucl.Phys. B499 (1997) 3-28

Physics

High Energy Physics

High Energy Physics - Theory

28 LaTex pages with 2 figs

Scientific paper

10.1016/S0550-3213(97)00315-5

We derive the universal threshold corrections in heterotic string theory including a continuous Wilson line. Unification of gauge and gravitational couplings is shown to be possible even within perturbative string theory. The relative importance of gauge group dependent and independent thresholds on unification is clarified. Equipped with these results we can then attempt an extrapolation to the strongly coupled heterotic string -- M-theory. We argue that such an extrapolation might be meaningful because of the holomorphic structure of the gauge coupling function and the close connection of the threshold corrections to the anomaly cancelation mechanism.

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