Instantons in σ model and tau functions
classification
🌊 nlin.SI
math-phmath.MP
keywords
functionsmodelsigmaapproachcontributionsexamplehierarchiesinstanton
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We show that a number of multiple integrals may viewed as tau functions of various integrable hierarchies. The instanton contributions in the two-dimensional O(3)$\ \sigma $ model is an example of such an approach.
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