Nonlinear Sciences – Exactly Solvable and Integrable Systems
Scientific paper
2005-07-08
Phys. Rev. Lett. 95, 204101 (2005)
Nonlinear Sciences
Exactly Solvable and Integrable Systems
4 pages, 1 figure, final version published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.95.204101
We propose a general method to derive kinetic equations for dense soliton gases in physical systems described by integrable nonlinear wave equations. The kinetic equation describes evolution of the spectral distribution function of solitons due to soliton-soliton collisions. Owing to complete integrability of the soliton equations, only pairwise soliton interactions contribute to the solution and the evolution reduces to a transport of the eigenvalues of the associated spectral problem with the corresponding soliton velocities modified by the collisions. The proposed general procedure of the derivation of the kinetic equation is illustrated by the examples of the Korteweg -- de Vries (KdV) and nonlinear Schr\"odinger (NLS) equations. As a simple physical example we construct an explicit solution for the case of interaction of two cold NLS soliton gases.
El Gennady A.
Kamchatnov Anatoly M.
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