Geodesic
Integrable model of a~nonlinear complex scalar field with nontrivial asymptotic behavior of soliton solutions
Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 2, pp. 186-194

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The field theory model in two-dimensional space-time with the Lagrangiaa $$ L=\frac{\vert\partial_{\mu}\psi\vert^2}{1-\lambda^2\vert\psi\vert^2}+m^2(\vert\psi\vert^2-\lambda^{-2}) $$ is studied. It is a completely integrable Hamiltonian system. The explicit form of $N$-soliton solutions with asymptotic behavior $\vert\psi\vert\to\lambda^{-1}$ as $\vert x\vert\to\infty$ is found. 
@article{TMF_1979_38_2_a4,
     author = {B. S. Getmanov},
     title = {Integrable model of a~nonlinear complex scalar field with nontrivial asymptotic behavior of soliton solutions},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {186--194},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1979_38_2_a4/}
}
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B. S. Getmanov. Integrable model of a~nonlinear complex scalar field with nontrivial asymptotic behavior of soliton solutions. Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 2, pp. 186-194. http://geodesic.mathdoc.fr/item/TMF_1979_38_2_a4/