The Mathematics of Fivebranes
arXiv:hep-th/9810157
Abstract
Fivebranes are non-perturbative objects in string theory that generalize two-dimensional conformal field theory and relate such diverse subjects as moduli spaces of vector bundles on surfaces, automorphic forms, elliptic genera, the geometry of Calabi-Yau threefolds, and generalized Kac-Moody algebras.
10 pages, 2 figures, Lecture at ICM'98