THRESHOLD CORRECTIONS AND SYMMETRY ENHANCEMENT IN STRING COMPACTIFICATIONS

被引：57

作者：

CARDOSO, GL ^{[1
]}

LUST, D ^{[1
]}

MOHAUPT, T ^{[1
]}

机构：

[1] DESY IFH ZEUTHEN,D-15738 ZEUTHEN,GERMANY

来源：

NUCLEAR PHYSICS B | 1995年 / 450卷 / 1-2期

关键词：

D O I：

10.1016/0550-3213(95)00315-J

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We present the computation of threshold functions for Abelian orbifold compactifications, Specifically, starting from the massive, moduli-dependent string spectrum after compactification, we derive the threshold functions as target space duality invariant free energies (sum over massive string states). In particular we work out the dependence on the continuous Wilson line moduli fields. In addition we concentrate on the physically interesting effect that at certain critical points in the orbifold moduli spaces additional massless states appear in the string spectrum leading to logarithmic singularities in the threshold functions. We discuss this effect for the gauge coupling threshold corrections; here the appearance of additional massless states is directly related to the Higgs effect in string theory. In addition the singularities in the threshold functions are relevant for the loop corrections to the gravitational coupling constants.

引用

页码：115 / 173

页数：59

共 64 条

[1] MODULI CORRECTIONS TO GAUGE AND GRAVITATIONAL COUPLINGS IN 4-DIMENSIONAL SUPERSTRINGS [J].