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Bright and dark solitons for a variable-coefficient (2 + 1) dimensional Heisenberg ferromagnetic spin chain equation

机译:变系数(2 +1)维Heisenberg铁磁自旋链方程的明暗孤子

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摘要

Under investigation in this paper is a variable-coefficient (2 + 1) dimensional Heisenberg ferromagnetic spin chain equation. Bilinear forms for the bright and dark soliton solutions are respectively obtained. Bright and dark solitons are obtained via the Hirota bilinear method. Features of the bright and dark solitons are discussed. Interaction properties of the bright and dark solitons are discussed via the asymptotic analysis, and stability of the bright and dark solitons is studied via the numerical calculation: (1) Amplitudes of the bright and dark solitons are not related to the coefficient delta(4)(t), while the soliton velocities are related to delta(4)(t). (2) Interactions between the bright two solitons are shown to be elastic, while interactions between the dark two solitons could be elastic or inelastic, which is determined by the values of rho. (3) Numerical calculation indicates that the bright solitons could not resist the disturbance of small perturbations, while the dark solitons could resist the disturbance of small perturbations.
机译:本文正在研究的是变系数(2 +1)维Heisenberg铁磁自旋链方程。分别获得了亮和暗孤子解的双线性形式。明亮和黑暗孤子是通过Hirota双线性方法获得的。讨论了亮和暗孤子的特征。通过渐近分析讨论了亮和暗孤子的相互作用特性,并通过数值计算研究了亮和暗孤子的稳定性:(1)亮和暗孤子的振幅与系数δ无关(4) (t),而孤子速度与delta(4)(t)有关。 (2)亮的两个孤子之间的相互作用被证明是弹性的,而暗的两个孤子之间的相互作用可以是弹性或非弹性的,这取决于rho的值。 (3)数值计算表明,亮孤子不能抵抗小扰动的扰动,而暗孤子却不能抵抗小扰动的扰动。

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