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Central Extensions of Gauge Groups Revisited
A. Losev, G. Moore, N. Nekrasov +1
We present an explicit construction for the central extension of the group $\Map(X, G)$ where is a compact manifold and is a Lie group. If is a complex curve we obtain…
Algebras, BPS States, and Strings
J. A. Harvey, G. Moore
We clarify the role played by BPS states in the calculation of threshold corrections of D=4, N=2 heterotic string compactifications. We evaluate these corrections for some classes…
Four-Dimensional Avatars of Two-Dimensional RCFT
A. Losev, G. Moore, N. Nekrasov +1
We investigate a 4D analog of 2D WZW theory. The theory turns out to have surprising finiteness properties and an infinite-dimensional current algebra symmetry. Some correlation fu…
Reducing - duality to - duality
J. A. Harvey, G. Moore, A. Strominger
The infrared limit of Yang-Mills theory with compact gauge group compactified on a two-torus is governed by an effective superconformal field theory. We conjecture…