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- W4387390079 abstract "The generating series for the instanton contribution to Green functions of the $2D$ sigma model was found in the works of Schwarz, Fateev and Frolov. We show that this series can be written as a formal tau function of the two-sided two-component KP hierarchy. We call it formal singular tau function because this tau function is a sum where each term is the infrared and ultraviolet divergent one exactly as the series found by the mentioned authors. However one can regularize this singluar tau function and to obtain regular observables. This is because observables contains ratious of mentioned divergent expressions. Thus, we enladge the families of tau functions to work with." @default.
- W4387390079 created "2023-10-06" @default.
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- W4387390079 date "2023-10-04" @default.
- W4387390079 modified "2023-10-07" @default.
- W4387390079 title "Sigma model instantons and singular tau function" @default.
- W4387390079 doi "https://doi.org/10.48550/arxiv.2310.02737" @default.
- W4387390079 hasPublicationYear "2023" @default.
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