On Gauge Couplings in String Theory

Details On Gauge Couplings in String Theory On Gauge Couplings in String Theory

1995-02-14

arxiv.org/abs/hep-th/9502077v2

Nucl.Phys. B444 (1995) 191-244

Physics

High Energy Physics

High Energy Physics - Theory

82 pages, 6 in-line figures, uses phyzzx.tex and epsf.tex macros

Scientific paper

10.1016/0550-3213(95)00172-O

We investigate the field dependence of the gauge couplings of $N=1$ string vacua from the point of view of the low energy effective quantum field theory. We find that field-theoretical considerations severely constrain the form of the string loop corrections; in particular, the dilaton dependence of the gauge couplings is completely universal at the one-loop level. The moduli dependence of the string threshold corrections is also constrained, and we illustrate the power of such constraints with a detailed discussion of the orbifold vacua and the $(2,2)$ (Calabi-Yau) vacua of the heterotic string.

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