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arXiv 2001.02958math.APmath.OC
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加权两相Dirichlet eigenvalue的形状optimization

Shape optimization of a weighted two-phase Dirichlet eigenvalue

Idriss Mazari, Grégoire Nadin, Yannick Privat

摘要:

设$m$为有界函数,$α$为非负参数.本文讨论了在Dirichlet边界条件下,由$\mathcal L\_m(u)= -\operatorname{div} \left((1+αm)\nabla u\right)-mu$给出的漂移Laplacian型算子$\mathcal L\_m$的第一特征值$λ\_α(m)$.假设$m$上的点态和整数界是一致的,我们研究了关于$m$的最小化$λ\_α(m)$的问题.这样的问题与所谓的"两阶段极值本征值问题"有关,并且自然地产生,例如在种群动力学中,它与域中物种的生存能力有关。我们证明,除非域是一个球,这个问题没有“正规”的解决方案。然后,我们提供了一个仔细的分析的情况下,一个球:(1)特征的所有径向对称的资源分布的解决方案,与一个新的方法的帮助下,涉及一个均匀化的版本的问题;(2)在更一般的情况下证明,一个稳定的结果,为中心的资源分布的单调性原则的帮助下,二阶形状导数,显着简化了分析.

英文摘要:

Let $m$ be a bounded function and $α$ a nonnegative parameter. This article is concerned with the first eigenvalue $λ\_α(m)$ of the drifted Laplacian type operator $\mathcal L\_m$ given by $\mathcal L\_m(u)= -\operatorname{div} \left((1+αm)\nabla u\right)-mu$ on a smooth bounded domain, with Dirichlet boundary conditions. Assuming uniform pointwise and integral bounds on $m$, we investigate the issue of minimizing $λ\_α(m)$ with respect to $m$. Such a problem is related to the so-called "two phase extremal eigenvalue problem" and arises naturally, for instance in population dynamics where it is related to the survival ability of a species in a domain. We prove that unless the domain is a ball, this problem has no "regular" solution. We then provide a careful analysis in the case of a ball by: (1) characterizing the solution among all radially symmetric resources distributions, with the help of a new method involving a homogenized version of the problem; (2) proving in a more general setting, a stability result for the centered distribution of resources with the help of a monotonicity principle for second order shape derivatives which significantly simplifies the analysis.

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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