String Loop Threshold Corrections \break For ${\mathbf{Z}}_N$ Coxeter Orbifolds

Abstract

The moduli dependence of string loop threshold corrections to gauge coupling constants is investigated for those ${\mathbf{Z}}_N$ Coxeter orbifolds with the property that some twisted sectors have fixed planes for which the six-torus ${\mathbf{T}}_6$ can not be decomposed into a direct sum ${\mathbf{T}}_4⨁{\mathbf{T}}_2$ with the fixed plane lying in ${\mathbf{T}}_2.$

15 pages, QMW--TH--93/22, SUSX--TH--93/14

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