Geodesic
Integration of the $\varphi^4$ model in elliptic Jacobi functions and investigation of them by the phase plane method
Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 3, pp. 440-452 Cet article a éte moissonné depuis la source Math-Net.Ru

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Solutions are obtained for the $\varphi^4$ model for different relationships between the signs of the constants in the Hamiltonian in the form of Jacobi elliptic functions. Such essentially nonlinear solutions, investigated on the phase plane, go over into kinks or solitons in the limiting ease for the parameter E on the separatrices S. For the lowest state $E_{\min}=U(\varphi_0)$ (vacuum), the solutions are transformed into a vacuum condensate (harmonic oscillations). Expansion of the solutions near the vacuum corresponds to the result of perturbation theory. 
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     title = {Integration of the $\varphi^4$ model in elliptic {Jacobi} functions and investigation of them by the phase plane method},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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V. E. Grishin; V. K. Fedyanin. Integration of the $\varphi^4$ model in elliptic Jacobi functions and investigation of them by the phase plane method. Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 3, pp. 440-452. http://geodesic.mathdoc.fr/item/TMF_1984_59_3_a10/

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