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arXiv 2302.13422math.APmath.DG
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一类单相奇异扰动问题的非退化性和极限稳定性

Nondegeneracy and stability in the limit of a one-phase singular perturbation problem

Nikola Kamburov

摘要:

我们研究解决方案的一个阶段的奇异扰动问题,出现在燃烧理论和正式近似的经典的一个阶段的自由边界问题。我们引入了一个自然密度的过渡层本身的条件,保证解决方案的关键非退化增长性能得到满足,并保持在极限。然后,我们将我们的结果的问题分类的基本半线性问题的全局稳定的解决方案,我们表明,这些有平坦的水平集尺寸$n\leq 4$,提供的密度条件得到满足。我们使用的稳定性的概念是一个相对于内域变形和在这个过程中,我们推导出简洁的新公式的第一和第二内部变化的一般泛函的形式$I(v) = \int |\nabla v|^2 + \mathcal{F}(v)$,持有在黎曼流形设置。

英文摘要:

We study solutions to a one-phase singular perturbation problem that arises in combustion theory and that formally approximates the classical one-phase free boundary problem. We introduce a natural density condition on the transition layers themselves that guarantees that the key nondegeneracy growth property of solutions is satisfied and preserved in the limit. We then apply our result to the problem of classifying global stable solutions of the underlying semilinear problem and we show that those have flat level sets in dimensions $n\leq 4$, provided the density condition is fulfilled. The notion of stability that we use is the one with respect to inner domain deformations and in the process, we derive succinct new formulas for the first and second inner variations of general functionals of the form $I(v) = \int |\nabla v|^2 + \mathcal{F}(v)$ that hold in a Riemannian manifold setting.

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