scholarly journals Interaction of Solitons for Sine-Gordon-Type Equations

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Georgii A. Omel’yanov ◽  
Israel Segundo-Caballero
Keyword(s):  
Numerical Simulation ◽  
Asymptotic Analysis ◽  
Small Parameter ◽  
Wave Equations ◽  
Gordon Equation ◽  
Sine Gordon Equation ◽  
Semilinear Wave Equations ◽  
The Subject ◽  
Interaction Of Solitons

The subject of our consideration is a family of semilinear wave equations with a small parameter and nonlinearities which provide the existence of kink-type solutions (solitons). Using asymptotic analysis and numerical simulation, we demonstrate that solitons of the same type (kinks or antikinks) interact in the same manner as for the sine-Gordon equation. However, solitons of the different type preserve the shape after the interaction only in the case of two or three waves, and, moreover, under some additional conditions.

Interaction of kinks for semilinear wave equations with a small parameter

2006 ◽  
Vol 65 (2) ◽  
pp. 347-378 ◽  
Author(s):  
D.A. Kulagin ◽  
G.A. Omel’yanov
Keyword(s):  
Small Parameter ◽  
Wave Equations ◽  
Semilinear Wave Equations

Polynomial conserved densities for the sine-Gordon equations

1977 ◽  
Vol 352 (1671) ◽  
pp. 481-503 ◽  
Keyword(s):  
Inverse Scattering ◽  
Wave Equations ◽  
Gordon Equation ◽  
Numerical Solutions ◽  
Soliton Solutions ◽  
Inverse Scattering Method ◽  
Bäcklund Transformations ◽  
Scattering Method ◽  
Sine Gordon Equation ◽  
Backlund Transformations

Like a number of other nonlinear dispersive wave equations the sine–Gordonequation z , xt = sin z has both multi-soliton solutions and an infinity of conserved densities which are polynomials in z , x , z , xx , etc. We prove that the generalized sine–Gordon equation z , xt = F ( z ) has an infinity of such polynomial conserved densities if, and only if, F ( z ) = A e αz + B e – αz for complex valued A, B and α ≠ 0. If F ( z ) does not take the form A e αz + B e βz there is no p. c. d. of rank greater than two. If α ≠ – β there is only a finite number of p. c. ds. If α = – β then if A and B are non-zero all p. c. ds are of even rank; if either A or B vanishes the p. c. ds are of both even and odd ranks. We exhibit the first eleven p. c. ds in each case when α = – β and the first eight when α ≠ – β . Neither the odd rank p. c. ds in the case α = – β , nor the particular limited set of p. c. ds in the case when α ≠ – β have been reported before. We connect the existence of an infinity of p. c. ds with solutions of the equations through an inverse scattering method, with Bäcklund transformations and, via Noether’s theorem, with infinitesimal Bäcklund transformations. All equations with Bäcklund transformations have an infinity of p. c. ds but not all such p. c. ds can be generated from the Bäcklund transformations. We deduce that multiple sine–Gordon equations like z , xt = sin z + ½ sin ½ z , which have applications in the theory of short optical pulse propagation, do not have an infinity of p. c. ds. For these equations we find essentially three conservation laws: one and only one of these is a p. c. d. and this is of rank two. We conclude that the multiple sine–Gordons will not be soluble by present formulations of the inverse scattering method despite numerical solutions which show soliton like behaviour. Results and conclusions are wholly consistent with the theorem that the generalized sine–Gordon equation has auto-Bäcklund transformations if, and only if Ḟ ( z ) – α 2 F ( z ) = 0.

Separation Transformation and New Exact Solutions for the (1+N)-Dimensional Triple Sine-Gordon Equation

2011 ◽  
Vol 66 (1-2) ◽  
pp. 19-23 ◽  
Author(s):  
Yifang Liu ◽  
Jiuping Chen ◽  
Weifeng Hu ◽  
Li-Li Zhu
Keyword(s):  
Exact Solution ◽  
Nonlinear Wave ◽  
Wave Equations ◽  
Gordon Equation ◽  
Transformation Method ◽  
Nonlinear Wave Equations ◽  
High Dimensional ◽  
Sine Gordon Equation ◽  
New Exact Solutions ◽  
Localized Structures

The separation transformation method is extended to the (1+N)-dimensional triple Sine-Gordon equation and a special type of implicitly exact solution for this equation is obtained. The exact solution contains an arbitrary function which may lead to abundant localized structures of the high dimensional nonlinear wave equations. The separation transformation method in this paper can also be applied to other kinds of high-dimensional nonlinear wave equations

Numerical simulation of quasi-periodic solutions of the sine-Gordon equation

1995 ◽  
Vol 87 (1-4) ◽  
pp. 37-47 ◽  
Author(s):  
Mark J. Ablowitz ◽  
B.M. Herbst ◽  
Constance M. Schober
Keyword(s):  
Numerical Simulation ◽  
Periodic Solutions ◽  
Gordon Equation ◽  
Sine Gordon Equation

scholarly journals Conservation laws of coupled semilinear wave equations

2016 ◽  
Vol 30 (28n29) ◽  
pp. 1640004 ◽  
Author(s):  
Stephen C. Anco ◽  
Chaudry Masood Khalique
Keyword(s):  
Conservation Laws ◽  
Wave Equations ◽  
Gordon Equation ◽  
Complete Classification ◽  
Conserved Quantities ◽  
Semilinear Wave Equations ◽  
Two Component ◽  
Klein Gordon ◽  
Klein Gordon Equation

A complete classification of all low-order conservation laws is carried out for a system of coupled semilinear wave equations which is a natural two-component generalization of the nonlinear Klein–Gordon equation. The conserved quantities defined by these conservation laws are derived and their physical meaning is discussed.

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