String Junctions and Non-Simply Connected Gauge Groups
High Energy Physics - Theory
2009-11-07 v1
Abstract
Relations between the global structure of the gauge group in elliptic F-theory compactifications, fractional null string junctions, and the Mordell-Weil lattice of rational sections are discussed. We extend results in the literature, which pertain primarily to rational elliptic surfaces and obtain pi^1(G) where G is the semi-simple part of the gauge group. We show how to obtain the full global structure of the gauge group, including all U(1) factors. Our methods are not restricted to rational elliptic surfaces. We also consider elliptic K3's and K3-fibered Calabi-Yau three-folds.
Cite
@article{arxiv.hep-th/0102031,
title = {String Junctions and Non-Simply Connected Gauge Groups},
author = {Zachary Guralnik},
journal= {arXiv preprint arXiv:hep-th/0102031},
year = {2009}
}
Comments
latex, 34 pages, 8 figures