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arXiv 2607.04418math.MG
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关于高阶狄利克雷特征值的非平凡布伦 - 闵可夫斯基不等式的不可能性

Impossibility of a nontrivial Brunn--Minkowski inequality for higher Dirichlet eigenvalue

Trí Minh Lê, Khai-Hoan Nguyen-Dang

AI总结:

研究凸体\(K\)的第\(j\)个狄利克雷特征值\(\lambda_j(K)\),已知\(\lambda_1\)满足布伦 - 闵可夫斯基不等式,证明对于\(j\geq2\)不存在类似情况,若\(K\mapsto(f\circ\lambda_j)(K)\)凹则\(f\)为常数。

摘要:

设\(\lambda_j(K)\)为凸体\(K\)的第\(j\)个狄利克雷特征值。众所周知,\(\lambda_1\)满足布伦 - 闵可夫斯基不等式:\(K\mapsto\lambda_1(K)^{-1/2}\)在凸体族上是凹的。我们表明对于高阶特征值不存在类似陈述。更确切地说,对于任何\(j\geq2\)和\(N\geq2\),如果对于某个函数\(f:(0,\infty)\to\mathbb{R}\),\(K\mapsto(f\circ\lambda_j)(K)\)在\(\mathbb{R}^N\)中的凸体族上是凹的,那么\(f\)必定是常数。

英文摘要:

Let $λ_j(K)$ be the $j$th Dirichlet eigenvalue of a convex body $K$. It is well known that $λ_1$ satisfies a Brunn--Minkowski inequality: $K \mapsto λ_1(K)^{-1/2}$ is concave on the family of convex bodies. We show that no analogous statement holds for higher eigenvalues. More precisely, for any $j \geq 2$ and $N \geq 2$, if $K \mapsto (f \circ λ_j)(K)$ is concave on the family of convex bodies in $\mathbb{R}^N$ for some function $f: (0, \infty) \to \mathbb{R}$, then $f$ must be constant.

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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