Harmonic Spheres Conjecture
We discuss the harmonic spheres conjecture, relatingthe space of harmonic maps of the Riemann sphere into the loop space of a compact Lie group G with the moduli space of Yang–Mills G-fields on four-dimensional Euclidean space.
KeywordsHarmonic spheres Yang–Mills fields instantons loop spaces Atiyah theorem Donaldson theorem Hilbert–Schmidt Grassmannian
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