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高维微分-差分模型的Virasoro对称子代数,多线性变量分离解和局域激发模式

沈守枫

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高维微分-差分模型的Virasoro对称子代数,多线性变量分离解和局域激发模式

沈守枫

Virasoro symmetry subalgebra, multi-linear variable separation solutions and localized excitations of higher-dimensional differential-difference models

Shen Shou-Feng
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  • 寻找高维可积模型是非线性科学中的重要课题.利用无穷维Virasoro对称子代数[σ(f1),σ(f2)]=σ(f′1f2-f′2f1)和向量场的延拓结构理论,能够得到各种高维模型.选取一些特殊的实现,可以给出具有无穷维Virasoro对称子代数意义下的高维微分可积模型.把该方法推广到微分-差分模型上,构造出具有弱多线性变量分离可解性的(3+1)维类Toda晶格.另外,该模型的一个约化方程为具有多线性变量分离可解性的(2+1)维特殊Toda晶格.连续运用对称约化方法可以得到此特殊Toda晶格的一个(1+1)维约化方程具有多线性变量分离可解性.因为得到的精确解里含有低维任意函数,从而可以构造出丰富地局域激发模式,如dromion解,lump解,环孤子解,呼吸子解,瞬子解,混沌斑图和分形斑图等等.
    Seeking for higher-dimensional integrable models is important in nonlinear science. By using the infinite dimensions Virasoro symmetry subalgebra[σ(f1),σ(f2)]=σ(f′1f2-f′2f1) and prolongation theory, many higher-dimensional models can be derived. By means of a concrete realization, some higher-dimensional differential integrable models with infinite dimensions Virasoro symmetry subalgebra can be obtained. In this paper, this method is extended to obtain differential-difference models and a (3+1)-dimensional Toda-like lattice which is week multi-linear variable separation solvable (MLVSS) model is derived. In addition, this model can be symmetry reduced to a (2+1)-dimensional special Toda lattice which is a MLVSS model. A (1+1)-dimensional MLVSS Toda lattice also can be obtained. Because some arbitrary functions are included, abundant new localized excitations such as dromion solution, lump solution, ring soliton, breather instanton et al can be found by selecting appropriate functions.
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  • 被引次数: 0
出版历程
  • 收稿日期:  2005-12-24
  • 修回日期:  2006-01-11
  • 刊出日期:  2006-11-20

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