On gauge couplings in string theory
Abstract
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 fieldtheoretical considerations severely constrain the form of the string loop corrections; in particular, the dilaton dependence of the gauge couplings is completely universal at the oneloop 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) (CalabiYau) vacua of the heterotic string.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1995
 DOI:
 10.1016/05503213(95)00172O
 arXiv:
 arXiv:hepth/9502077
 Bibcode:
 1995NuPhB.444..191K
 Keywords:

 High Energy Physics  Theory
 EPrint:
 82 pages, 6 inline figures, uses phyzzx.tex and epsf.tex macros