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arXiv 2505.02453nlin.PS
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广义双分量长波短波共振相互作用系统:非简并矢量孤子及其碰撞动力学

General two-component long-wave short-wave resonance interaction system: Non-degenerate vector solitons and their collision dynamics

S. Stalin, M. Lakshmanan

AI总结:

本文在广义双分量LSRI模型中通过Hirota方法得到非简并N孤子解,分类并分析了两类非简并孤子的结构与碰撞动力学,结果适用于多物理领域。

摘要:

本文在具有广义形式非线性系数的完全可积双分量长波-短波共振相互作用模型中,展示了非简并亮孤子的产生并总结了其若干有趣特征。通过经典的Hirota双线性方法,我们得到了该LSRI模型的Gram行列式形式完全非简并N孤子解。根据速度条件的选择,所得非简并基孤子分为两类,即(1,1,1)型和(1,1,2)型非简并单孤子。我们随后表明,基本的(1,1,1)型非简并孤子呈现新颖的轮廓结构,包括双峰、特殊平顶和传统单峰轮廓;而(1,1,2)型非简并孤子允许类似双孤子的斜碰撞,其行为类似于具有短茎结构的KP线孤子相互作用。我们进行了详细的渐近分析以研究(1,1,1)型非简并孤子的长时间行为,结果表明它们会发生形状保持和形状改变的碰撞。然而,我们的分析证实,在适当移动时间坐标后,这些孤子之间的形状改变碰撞本质上变为弹性碰撞。此外,我们发现(1,1,2)型非简并孤子也会发生弹性碰撞。另外,我们还研究了简并孤子与(1,1,1)型非简并孤子碰撞过程中呼吸现象的形成或抑制。为完整起见,我们还指出了完全简并孤子之间的碰撞场景。本文提出的结果广泛适用于玻色-爱因斯坦凝聚体、非线性光学、等离子体物理及其他密切相关领域。

英文摘要:

In this paper, we demonstrate the emergence of non-degenerate bright solitons and summarize their several interesting features in a completely integrable two-component long-wave-short-wave resonance interaction model with a general form of nonlinearity coefficients. Through the classical Hirota's bilinear method, we obtain a fully non-degenerate $N$-soliton solution in Gram determinant form for this LSRI model. Depending on the choice of velocity conditions, the obtained non-degenerate fundamental soliton is classified into two types, namely ($1,1,1$)- and ($1,1,2$)-non-degenerate one solitons. We then show that the basic ($1,1,1$)-non-degenerate soliton exhibits novel profile structures, including a double-hump, a special flat-top, and a conventional single-hump profile, and ($1,1,2$)-non-degenerate soliton admits two-soliton like oblique collision, a behavior akin to KP line soliton interaction with a short stem structure. A detailed asymptotic analysis is carried out to study the long time behavior of ($1,1,1$)-non-degenerate solitons and it reveals that they undergo both shape-preserving and shape-changing collisions. However, our analysis confirms that the shape changing collision between these solitons become elastic in nature after appropriate shift of time coordinates. Further, we identified that the ($1,1,2$)-non-degenerate solitons also undergo elastic collision. In addition, we have also investigated the formation or suppression of breathing phenomena during collision between a degenerate soliton and a ($1,1,1$)-non-degenerate soliton. For completeness, we also point out the collision scenario between the completely degenerate solitons. The results presented in this paper are broadly applicable to Bose-Einstein condensates, nonlinear optics, plasma physics, and other closely related fields.

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