Bounds for eigenvalues of the Dirichlet problem for the logarithmic Laplacian

TL;DR

This paper establishes bounds for the eigenvalues of the Dirichlet problem involving the logarithmic Laplacian, extending classical methods and analyzing asymptotic behaviors independent of domain volume.

Contribution

It introduces new bounds for eigenvalues of the logarithmic Laplacian and explores their asymptotic limits, extending existing spectral analysis techniques.

Findings

Derived upper and lower bounds for eigenvalues.

Proved the limit of the sum of eigenvalues is volume-independent.

Analyzed asymptotic behavior of eigenvalues.

Abstract

We provide bounds for the sequence of eigenvalues $\{\lambda_i(\Omega)\}_i$ of the Dirichlet problem $$ L_\Delta u=\lambda u\ \ {\rm in}\ \, \Omega,\quad\quad u=0\ \ {\rm in}\ \ \mathbb{R}^N\setminus \Omega,$$ where $L_\Delta$ is the logarithmic Laplacian operator with Fourier transform symbol $2\ln |\zeta|$. The logarithmic Laplacian operator is not positively definitive if the volume of the domain is large enough. In this article, we obtain the upper and lower bounds for the sum of the first $k$ eigenvalues by extending the Li-Yau method and Kr\"oger's method respectively. Moreover, we show the limit of the sum of the first $k$ eigenvalues, which is independent of the volume of the domain. Finally, we discuss the lower and upper bounds of the $k$-th principle eigenvalue, the asymptotic behavior of the limit of eigenvalues.