Stable bundle extensions on elliptic Calabi-Yau threefolds
arXiv:math/0611762 · doi:10.1016/j.geomphys.2007.07.007
Abstract
We construct stable bundle extensions on elliptically fibered Calabi-Yau threefolds. We show that these bundles can solve the topological anomaly constraint in heterotic string theory without the need of invoking background fivebranes.
18 pages, minor changes