Gauge Coupling Unification with Extra Dimensions and Gravitational Scale Effects
Abstract
We study gauge coupling unification in the presence of extra dimensions compactified at a few TeV. Achieving unification requires a large number of gauge boson Kaluza-Klein excitations lighter than the string scale, such that the higher-dimensional gauge couplings are O(1) in string scale units. Corrections to the gauge couplings from two or more loops are about 10% or larger, hence string (or M) theory is generally expected to be strongly coupled in TeV-scale extra-dimensional scenarios. Higher-dimensional operators induced by quantum gravitational effects can shift the gauge couplings by a few percent. These effects are sufficiently large that even the minimal Standard Model, or the MSSM, allow unification at a scale in the TeV range. The strongly coupled unified theory may induce dynamical electroweak symmetry breaking.
Cite
@article{arxiv.hep-ph/9906327,
title = {Gauge Coupling Unification with Extra Dimensions and Gravitational Scale Effects},
author = {Hsin-Chia Cheng and Bogdan A. Dobrescu and Christopher T. Hill},
journal= {arXiv preprint arXiv:hep-ph/9906327},
year = {2009}
}
Comments
25 pages, LaTex, 3 figures. References added