On the energy spectrum of Yang--Mills instantons over asymptotically locally flat spaces
arXiv:1103.0241 · doi:10.1007/s00220-013-1754-6
Abstract
In this paper we prove that over an asymptotically locally flat (ALF) Riemannian four-manifold the energy of an "admissible" SU(2) Yang--Mills is always integer. This result sharpens the previously known energy identity for such Yang--Mills instantons over ALF geometries. Furthermore we demonstrate that this statement continues to hold for the larger gauge group U(2). Finally we make the observation that there might be a natural relationship between 4 dimensional Yang--Mills theory over an ALF space and 2 dimensional conformal field theory. This would provide a further support for the existence of a similar correspondence investigated by several authors recently.
LaTeX, no figures, 18 pp, final published version
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