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arXiv 2108.00448math.AP
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非线性分式问题的低阶渐近性

Small order asymptotics for nonlinear fractional problems

Víctor Hernández-Santamaría, Alberto Saldaña

摘要:

研究了当参数$s$趋于零时,含$2s$阶分数阶拉普拉斯算子的非线性边值问题解的极限行为.特别是,我们表明,最低能量的解决方案收敛(到一个子序列)到一个非平凡的非负最低能量的解决方案的限制问题的对数拉普拉斯算子,即,傅立叶符号为$\ln(|ξ|^2)$的伪微分算子。这些结果的动机是一些应用程序的非局部模型,其中一个小的值的参数$s$产生的最佳选择。我们的方法是基于变分方法,统一的能量导出估计,并使用一个新的动力学型Sobolev不等式。

英文摘要:

We study the limiting behavior of solutions to boundary value nonlinear problems involving the fractional Laplacian of order $2s$ when the parameter $s$ tends to zero. In particular, we show that least-energy solutions converge (up to a subsequence) to a nontrivial nonnegative least-energy solution of a limiting problem in terms of the logarithmic Laplacian, i.e., the pseudodifferential operator with Fourier symbol $\ln(|ξ|^2)$. These results are motivated by some applications of nonlocal models where a small value for the parameter $s$ yields the optimal choice. Our approach is based on variational methods, uniform energy-derived estimates, and the use of a new logarithmic-type Sobolev inequality.

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