Unification with Low String Scale
arXiv:hep-ph/9807415 · doi:10.1088/1126-6708/1998/11/023
Abstract
I argue that in open-string theory with hierarchically small (or large) extra dimensions, gauge groups can unify naturally with logarithmically-running coupling constants at the high Kaluza-Klein (or string-winding) scale. This opens up the possibility of rescuing the standard logarithmic unification at GeV even if the fundamental-string scale is much lower, at intermediate or possibly even electroweak scales. I also explain, however, why a low type-I string scale may not suffice to obliterate the ultraviolet problems usually associated with the gauge hierarchy.
6 pages, uses harvmac. Two minor changes. Final version to appear in JHEP
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