混合局部和非局部算子的Hong-Krahn-Szegö不等式
A Hong-Krahn-Szegö inequality for mixed local and nonlocal operators
摘要：
给定一个有界开集$Ω\subseteq{\mathbb{R}}^n$，研究了在$Ω$的补中具有消失条件的非线性混合局部/非局部算子的特征值问题.证明了体积为$Ω$一半的球形$B$的第二特征值$λ_2(Ω)$总是严格大于第一特征值$λ_1(B)$.通过与极限情况（$Ω$由两个相距较远的相等球组成）的比较，证明了该界是尖锐的.更确切地说，不同于当地的情况下，第二个本征值问题的最佳形状不存在，但最小化序列是由两个不相交的球的一半体积的相互距离趋于无穷大的联盟。
英文摘要：
Given a bounded open set $Ω\subseteq{\mathbb{R}}^n$, we consider the eigenvalue problem of a nonlinear mixed local/nonlocal operator with vanishing conditions in the complement of $Ω$. We prove that the second eigenvalue $λ_2(Ω)$ is always strictly larger than the first eigenvalue $λ_1(B)$ of a ball $B$ with volume half of that of $Ω$. This bound is proven to be sharp, by comparing to the limit case in which $Ω$ consists of two equal balls far from each other. More precisely, differently from the local case, an optimal shape for the second eigenvalue problem does not exist, but a minimizing sequence is given by the union of two disjoint balls of half volume whose mutual distance tends to infinity.
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