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Instantons in two and four dimensions. (English) Zbl 0564.58040
The purpose of this paper is to strengthen the analogy concerning the instantons in pure Yang-Mills theory in 4-dimensions and in the $$CP_ n$$-models in 2-dimensions. Essentially the author shows (at least for G a classical group and probably for all G) that Yang-Mills instantons in 4D can be naturally identified with (i.e. have the same parameter space as) the instantons in 2D for the theory in which the complex projective n- space $$CP_ n$$ is replaced by the infinite-dimensional manifold $$\Omega$$ G of loops on the structure group G.
Reviewer: M.Martellini

##### MSC:
 58J90 Applications of PDEs on manifolds 81T08 Constructive quantum field theory
##### Keywords:
instantons; Yang-Mills theory; Yang-Mills instantons
Full Text:
##### References:
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