By Prof. Vasily Yu. Belashov, Prof. Sergey V. Vladimirov (auth.)

ISBN-10: 3540233768

ISBN-13: 9783540233763

ISBN-10: 3540268804

ISBN-13: 9783540268802

This ebook is dedicated to at least one of the main fascinating and quickly constructing parts of contemporary nonlinear physics and arithmetic - the theoretical, analytical and complex numerical, learn of the constitution and dynamics of one-dimensional in addition to - and three-d solitons and nonlinear waves defined by way of Korteweg-de Vries (KdV), Kadomtsev-Petviashvili (KP), nonlinear Schrödinger (NLS) and by-product NLS (DNLS) sessions of equations. specified consciousness is paid to generalizations (relevant to numerous advanced actual media) of those equations, accounting for higher-order dispersion corrections, impression of dissipation, instabilities, and stochastic fluctuations of the wave fields. The booklet addresses researchers operating within the idea and numerical simulations of dispersive advanced media in such fields as hydrodynamics, plasma physics, and aerodynamics. it is going to even be valuable as a reference paintings for graduate scholars in physics and mathematics.

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**Extra resources for Solitary Waves in Dispersive Complex Media: Theory · Simulation · Applications**

**Example text**

The potential u(x, t) in the Schr¨ odinger operator is determined with S(t) as the scattering data. Each stage implies solution of a linear problem only. 2 IST and Analytical Integration 3 3 S(t) = r(k, 0)e8ik t , κn , bn e8κn t , n = 1, . . , N . 57) We in fact integrated the KdV equation by means of the (implicit) change of the variables u(x) → S. The inverse change S(t) → u(x, t) gives us the solution of the KdV equation. 1. This scheme, despite the absence of a general analytical solution for both direct and inverse problems, enables us to ﬁnd very important exact solutions of the KdV equation analytically, in particular, the one-soliton solution, and, in a more general case, the N -soliton solutions describing interactions (collisions) of KdV solitons.

N ) for the discrete spectrum: 1. , κ˙ n = 0; 2. 54) because by deﬁnition bn is a factor in the asymptotic expansion of the function ϕ(x, iκn ), where ϕ(x, iκn ) = bn (t)e−κn x + O e−κn x , x → +∞. 54), we obtain for k = iκn that b˙ n = 8κ3n bn . 1. Scheme of solution of the initial value problem for the KdV equation u(x, 0) Ist stage ⇓ S(0) IInd stage ⇓ S(t) ⇓ u(x, t) IIIrd stage Consists of calculation of the scattering data S(0), with the initial condition u(x, t)|t=0 = u(x, 0), by ﬁnding the eigenfunctions of the Schr¨ odinger operator with the potential u(x, 0).

The Burgers equation. Consider the equation describing nonlinear waves in a medium with the “viscous” type of damping, ∂t u + u∂x u = ν∂x2 u. 33) This equation was obtained and analyzed by Burgers in 1940 [15] and is now called the Burgers equation. The general solution of this equation can also be obtained analytically. 34) for the function ϕ then one can obtain the heat conductivity (diﬀusion) equation ∂t ϕ = ν∂x2 ϕ. 34), where [3] 26 1. KdV-Class Solitons 1 ϕ(t, x) = √ 4πνt ∞ −∞ η 1 (x − η)2 − exp − 2ν 4νt ψ(η )dη dη.

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