Estimates for the first and second Steklov-Dirichlet eigenvalues
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866909601526448128 |
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| author | Sannipoli, Rossano |
| author_facet | Sannipoli, Rossano |
| contents | In this paper, we deal with the Steklov-Dirichlet eigenvalue problem for the Laplacian in annular domains. More precisely, we consider $Ω_r = Ω_0 \setminus \overline{B}_r$, where $Ω_0 \subset \mathbb{R}^n$, $n \geq 2$, is an open, bounded set with a Lipschitz boundary, and $B_r$ is the ball centered at the origin with radius $r > 0$, such that $\overline{B}_r \subset Ω_0$. In the first part of the paper, we focus on the first Steklov-Dirichlet eigenvalue $σ_1(Ω_r)$ and prove that the sequence of corresponding normalized eigenfunctions converges to a particular constant as $r \to 0^+$. This will allow us to prove an isoperimetric inequality for $ σ_1(Ω_r)$ when $r$ is small enough, under a measure constraint. The second part is focused on the second Steklov-Dirichlet eigenvalue $σ_2(Ω_r)$. We prove that it converges to the first non-trivial Steklov eigenvalue $\overlineσ_1(Ω_0)$ of the non-perforated domain $Ω_0$. This result, together with the Brock and Weinstock inequalities, respectively, allows us to prove two isoperimetric inequalities for small holes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_02757 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Estimates for the first and second Steklov-Dirichlet eigenvalues Sannipoli, Rossano Analysis of PDEs Spectral Theory 35B40, 35J25, 35P15 In this paper, we deal with the Steklov-Dirichlet eigenvalue problem for the Laplacian in annular domains. More precisely, we consider $Ω_r = Ω_0 \setminus \overline{B}_r$, where $Ω_0 \subset \mathbb{R}^n$, $n \geq 2$, is an open, bounded set with a Lipschitz boundary, and $B_r$ is the ball centered at the origin with radius $r > 0$, such that $\overline{B}_r \subset Ω_0$. In the first part of the paper, we focus on the first Steklov-Dirichlet eigenvalue $σ_1(Ω_r)$ and prove that the sequence of corresponding normalized eigenfunctions converges to a particular constant as $r \to 0^+$. This will allow us to prove an isoperimetric inequality for $ σ_1(Ω_r)$ when $r$ is small enough, under a measure constraint. The second part is focused on the second Steklov-Dirichlet eigenvalue $σ_2(Ω_r)$. We prove that it converges to the first non-trivial Steklov eigenvalue $\overlineσ_1(Ω_0)$ of the non-perforated domain $Ω_0$. This result, together with the Brock and Weinstock inequalities, respectively, allows us to prove two isoperimetric inequalities for small holes. |
| title | Estimates for the first and second Steklov-Dirichlet eigenvalues |
| topic | Analysis of PDEs Spectral Theory 35B40, 35J25, 35P15 |
| url | https://arxiv.org/abs/2505.02757 |