Geodesic
Nonlinear $\sigma$-model in a curved space, gauge equivalence, and exact solutions of
Teoretičeskaâ i matematičeskaâ fizika, Tome 115 (1998) no. 3, pp. 323-348 Cet article a éte moissonné depuis la source Math-Net.Ru

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We propose a nonlinear $\sigma$-model in a curved space as a general integrable elliptic model. We construct its exact solutions and obtain energy estimates near the critical point. We consider the Pohlmeyer transformation in Euclidean space and investigate the gauge equivalence conditions for a broad class of elliptic equations. We develop the inverse scattering transform method for the $\operatorname {sh}$-Gordon equation and evaluate its exact and asymptotic solutions. 
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E. Sh. Gutshabash; V. D. Lipovskii; S. S. Nikulichev. Nonlinear $\sigma$-model in a curved space, gauge equivalence, and exact solutions of. Teoretičeskaâ i matematičeskaâ fizika, Tome 115 (1998) no. 3, pp. 323-348. http://geodesic.mathdoc.fr/item/TMF_1998_115_3_a0/

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