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arXiv 2601.02810nlin.SInlin.PS
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多重双谷和单谷暗孤子在复修正科沃德-德维尔斯方程中的研究:保持形状碰撞与改变形状碰撞

Multiple double-valley and single-valley dark solitons in the complex modified Korteweg-de Vries equation: shape-preserving collisions and shape-altering collisions

Shenzhen University(深圳大学);Bishop Heber College(比숍希伯学院);Hubei University of Science and Technology(湖北科技学院)

Yingcan Huang, Jingsong He, T. Kanna, Jiguang Rao

AI总结:

研究复修正科沃德-德维尔斯方程中暗孤子的碰撞特性,揭示类型I和II暗孤子在形状保持与改变方面的差异及相互作用。

摘要:

在复修正科沃德-德维尔斯方程中,研究了暗孤子的保持形状碰撞和改变形状碰撞。所获得的暗孤子解被分为两种不同的类型,称为类型I和类型II暗孤子,它们在结构和动力学特性上具有根本性的差异。一个单一的类型I暗孤子关于其中心对称,并且具有三种不同的谷形,即单谷、双谷和平底结构,而一个单一的类型II暗孤子仅支持单谷形。这两种暗孤子在空间变量从-∞到+∞变化时的相位行为以及速度-振幅关系上存在差异。对于多个纯类型I暗孤子,碰撞保持形状;然而,非平凡的集体效应被揭示出来,修改一个孤子的参数可以引起其他孤子的轮廓和振幅的变化,尽管所有碰撞仍然保持弹性。相比之下,多个纯类型II暗孤子独立行为,仅经历相位转移而不改变其形状或振幅。当类型I和类型II暗孤子共存时,它们的相互作用导致真正的形状改变碰撞,其中类型I暗孤子的谷结构和振幅被修改,而类型II孤子仅经历相位转移。渐近分析进一步表明,类型II暗孤子对类型I暗孤子的影响局限于碰撞前阶段,并在碰撞后消失。

英文摘要:

The shape-preserving and shape-altering collisions of dark solitons are investigated in the complex modified Korteweg-de Vries equation. The obtained dark soliton solutions are classified into two distinct types, referred to as type-I and type-II dark solitons, which exhibit fundamentally different structural and dynamical characteristics. A single type-I dark soliton is symmetric about its center and admits three distinct valley profiles, namely single-valley, double-valley, and flat-bottom structures, whereas a single type-II dark soliton only supports a single-valley profile. These two types of dark solitons differ in their phase behaviors as the spatial variable varies from $-\infty$ to $+\infty$, as well as in their velocity--amplitude relations. For multiple pure type-I dark solitons, collisions are shape-preserving; however, a nontrivial collective effect is revealed in which modifying the parameters of one soliton can induce changes in the profiles and amplitudes of the other solitons, even though all collisions remain elastic in nature. In contrast, multiple pure type-II dark solitons behave independently, undergoing only phase shifts without any modification of their shapes or amplitudes. When type-I and type-II dark solitons coexist, their interactions lead to genuine shape-altering collisions, where the valley structures and amplitudes of type-I dark solitons are modified, while type-II solitons remain unaffected except for phase shifts. Asymptotic analysis further shows that the influence of type-II dark solitons on type-I dark solitons is confined to the pre-collision stage and disappears after the interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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