arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.07347math.AP
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变系数标量场方程孤波解的线性和轨道稳定性分析

Linear and orbital stability analysis for solitary-wave solutions of variable-coefficient scalar field equations

Mashael Alammari, Stanley Snelson

摘要:

研究了一般的实直线上的变系数半线性标量场方程。这些系数是一致的小,但缓慢衰减,常系数运营商的扰动。我们的动机是如何这些扰动的方程可能会改变扭结解(一维拓扑孤子)的稳定性。我们证明了存在一个固定的扭结解决方案,在我们的设置,并进行详细的谱分析相应的线性化运营商,基于扰动的线性化运营商周围的常数系数扭结。我们推导出一个公式,使我们能够检查是否出现一个离散的本征值从本质谱在这种扰动。已知的例子表明,这个额外的本征值可能有一个重要的影响,在附近的扭结的长时间动态。我们还建立了轨道稳定性的孤波解决方案的变系数制度,尽管可能存在的负本征值的线性化。

英文摘要:

We study general semilinear scalar-field equations on the real line with variable coefficients in the linear terms. These coefficients are uniformly small, but slowly decaying, perturbations of a constant-coefficient operator. We are motivated by the question of how these perturbations of the equation may change the stability properties of kink solutions (one-dimensional topological solitons). We prove existence of a stationary kink solution in our setting, and perform a detailed spectral analysis of the corresponding linearized operator, based on perturbing the linearized operator around the constant-coefficient kink. We derive a formula that allows us to check whether a discrete eigenvalue emerges from the essential spectrum under this perturbation. Known examples suggest that this extra eigenvalue may have an important influence on the long-time dynamics in a neighborhood of the kink. We also establish orbital stability of solitary-wave solutions in the variable-coefficient regime, despite the possible presence of negative eigenvalues in the linearization.

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