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arXiv 2406.05037math.AP
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现代生物形态学中产生的奇异振幅方程组的线性稳定性分析

Linear stability analysis for a system of singular amplitude equations arising in biomorphology

Aric Wheeler, Kevin Zumbrun

AI总结:

本文研究伴随守恒律的对流 Turing 分岔中奇异振幅方程组指数周期解的线性稳定性,通过双参数矩阵摄动分析证明已有必要条件对 Schneider 扩散稳定性亦充分,揭示其沿非正规双曲慢流形及横向均值模式的稳定性机制。

摘要:

我们研究了伴随守恒律的对流 Turing 分岔相关的一组奇异振幅方程的指数周期解的线性稳定性,该问题出现于现代生物形态学模型、二元流体及其他场景中。该系统由复 Ginzburg-Landau 方程与关联守恒律的“均值模式”下的奇异对流扩散方程耦合而成,作者此前已证明其可像经典 Ginzburg-Landau 情形一样进行常系数线性化稳定性分析——尽管此时在波振幅 epsilon 上是奇异的——从而为指数函数作为振幅方程的解以及求解底层 PDE 的相关周期模式提供了有用的稳定性必要条件。在此,我们通过精细的双参数矩阵摄动分析证明,严格满足这些必要条件对于 Schneider 意义下的扩散稳定性也是充分的,进而为底层 PDE 得出了相应的结论及非线性稳定性。此外,我们证明这些条件可被解释为沿由 Darcy 型约化逼近的非正规双曲慢流形的稳定性,以及沿横向均值模式的吸引性,这与 Hacker-Schneider-Zimmerman 的有限时间逼近定理相联系。

英文摘要:

We study linear stability of exponential periodic solutions of a system of singular amplitude equations associated with convective Turing bifurcation in the presence of conservation laws, as arises in modern biomorphology models, binary fluids, and elsewhere. Consisting of a complex Ginzburg-Landau equation coupled with a singular convection-diffusion equation in "mean modes" associated with conservation laws, these were shown previously by the authors to admit a constant-coefficient linearized stability analysis as in the classical Ginzburg-Landau case -- albeit now singular in wave amplitude epsilon -- yielding useful necessary conditions for stability, both of the exponential functions as solutions of the amplitude equations, and of the associated periodic pattern solving the underlying PDE. Here, we show by a delicate two-parameter matrix perturbation analysis that (strict) satisfaction of these necessary conditions is also sufficient for diffusive stability in the sense of Schneider, yielding a corresponding result, and nonlinear stability, for the underlying PDE. Moreover, we show that they may be interpreted as stability along a non-normally hyperbolic slow manifold approximated by Darcy-type reduction, together with attraction along transverse mean modes, connecting with finite-time approximation theorems of Hacker-Schneider-Zimmerman.

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