Interaction Between Line Soliton and Algebraic Soliton for Asymmetric Nizhnik-Novikov-Veselov Eq

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Commun.Theor.Phys.(Bering,China)49(2008)PP.1547—1552 ⑥Chinese Physical Society Vo1.49,No.6,June 15,2008 

Interaction Between Line Soliton and Algebraic Soliton for Asymmetric 

Nizhnik-Novikov-Veselov Equation 

RUAN Hang-Yu ,2,3 and LI Zhi—Fang1,十 

1Department of Physics,Ningbo University,Ningbo 315211,China 

2Nonlinear Science Center and Physics Department,Ningbo University,Ningbo 315211,China 

3State Key Laboratorv of Scientific and Engineering Computing,Institute of Computational Mathematics and Scientific Engineering Comput ing,Academy of Mathematics and System Sciences,the Chinese Academy of Sciences,P.O.Box 

2719,Beijing 100080,China 

(Received July 18,2007) 

A bstract Starting from the variable separation approach,the algebraic soliton solution and the solution describing the jnteraction between line soliton and algebraic soliron are obtained by selecting appropriate seed solution for(2+1)一 dimensional ANNV equation.%e behaviors of interactions are discussed in detail both analytically and graphicaily. R is shown that there are two如nds of singular interactions between line soliton and algebraic soliton:1)the resonant interaction where the algebraic soliton propagates together with the line soliton and persists infinitely;2)the extremely repuIsive interaction where the algebraic soliton affects the motion of the line soliton infinitely apart. 

PACS numbers:05.45.Yv Key words:variable separation approach,the interaction between line soliton and algebraic soliton,(2+1)一 

dimensional ANNV equation 

1 Introduction 

Sohtons and solitary wave solutions in (1+1)一 dimensional integrable nonlinear evolution models now 

have been understood very well both in theoretical aspects 

and in experimental aspects.However.the soliton struc— ture in higher spatial dimensions is still much more intri- 

cate.From the symmetry study of the f 2+1)一dimensional 

integrable models we know that there are richer symme— try structures than those in lower dimensions,ll,21 which 

indicates that the soliton structures and the interac— 

tions between solitons of the higher—dimensional nonlinear 

wave fields may show much richer phenomena than one— dimensional ones.For example,various interactions for the Kadomtsev-Petviashvili fKP1 equation[3J with posi— 

tive dispersions are considered as it has three kinds of soliton solutions:the conventional line.algebraic and pe- riodic soliton.Johnson and Thompson[4J and Freeman ̄5J 

investigated the interaction between line soliton and al— 

gebraic soliton.The interactions between two periodic solitons,periodic soliton and line soliton,the periodic 

soliton and algebraic soliton have been studied by sev— eral authors.【b一圳And in each case the existence of peri— 

odic soliton resonances was found.For another example, the Davey-Stewartson(DS)equation,which is the two- dimensional generalization of the nonlinear Schrbdinger (NLS)equation,【10,11】also has two-dimensional localized 

solutions.And the interactions between two 一periodic 

solitons,Y—periodic soliton and line soliton, 一periodic soli— ton and algebraic soliton of the DS I equation have been investigated.[12,13】 

To a great extent,deciding the practical application 

values of soliton theory relies on the properties of interac- 

tions between solitons.So it is very important to study soliton structures and the interactions between solitons 

for the higher—dimensional nonlinear models.The above 

interactions seem to be very interesting and whether such— like phenomena also exist in other higher..dimensional in.. 

tegrable models is unknown to us.Here we are interested 

in studing the(2+1)一dimensional asymmetric Nizhnik— 

Novikov—Veselov fANNV)equation 

+ 6zzz一3( 6 )z =0, z=v , (1) 

which may be considered as a model for an incompress— ible fluid,where and v are the components of the di— 

mensionless velocity.【 4J and has also been considered in 

Ref.f 15I as a generalization to(2+1)一dimensions of the 

results from Hirota Satsuma.【 6J The spectral transforma— 

tion for this system has been investigated in Ref.f171.The Painlev6 property.nonclassical symmetries and similarity solutions of the system have been studied by Clarkson and 

Mansfield.【 J In Refs.f61一f91 and f191,we know that based on the standard Hirota bilinear method[20】we can 

obtain the algebraic soliton solution,the solution describ— ing the interaction between line soliton and Y..periodic soli.. 

ton,the solution describing the interaction between two 

Y—periodic solitons and the solution describing the inter— 

action between Y—periodic soliton and algebraic soliton for 

the KP equation.But for the ANNV equation it seems 

The project supported by National Natural Science Foundation of China under Grant No.10675065,the Science Research Founda七ion of the Education Department of Zhejiang Province under Grant No under Grant No.Y604036 and the tCorresponding author,E-mail State Key Laboratory of Oil/Gas Lizhifang@nbu.edu.ca 20070979,and the Natura[Science Foundation of Zhejiang Province Reservoir Geology and Exploitation\PLN0402