On Rellich-type asymptotics for eigenfunctions on rank one symmetric spaces of noncompact type
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866917489809555456 |
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| author | Ganguly, Pritam |
| author_facet | Ganguly, Pritam |
| contents | We study eigenfunctions of the Laplace--Beltrami operator \(Δ_X\) in exterior domains \(Ω\) of rank-one Riemannian symmetric spaces of noncompact type \(X\), a class that includes all hyperbolic spaces. Extending the classical \(L^2\) Rellich theorem for the Euclidean Laplacian, we analyze the asymptotic behaviour and \(L^p\)-integrability of solutions to the Helmholtz equation
\[
Δ_X f + (λ^2 + ρ^2) f = 0 \quad \text{in } Ω,
\]
where \(λ\in \mathbb{C}\setminus i\mathbb{Z}\) and \(ρ\) denotes the half-sum of positive roots.
We establish sharp Rellich-type quantitative \(L^p\)-growth estimates in geodesic annuli, which yield the nonexistence of nontrivial \(L^p(Ω)\)-solutions in the optimal range \(1 \leq p \leq 2\) for spectral parameters satisfying \(|\Im(λ)| \leq (2/p - 1)ρ\). For non-real spectral parameters, we further obtain refined Rellich-type uniqueness results under weak \(L^p\)-assumptions. As a by-product, we also prove a Rellich-type uniqueness theorem in terms of Hardy-type norms.
Our results provide a geometric extension of the Euclidean Rellich theorem, highlighting the role of exponential volume growth and the \(p\)-dependence of the \(L^p\)-spectrum of \(Δ_X\) in producing genuinely non-Euclidean spectral phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_12561 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On Rellich-type asymptotics for eigenfunctions on rank one symmetric spaces of noncompact type Ganguly, Pritam Analysis of PDEs Classical Analysis and ODEs Primary: 43A85, 35J05, Secondary: 47A75, 58J50 We study eigenfunctions of the Laplace--Beltrami operator \(Δ_X\) in exterior domains \(Ω\) of rank-one Riemannian symmetric spaces of noncompact type \(X\), a class that includes all hyperbolic spaces. Extending the classical \(L^2\) Rellich theorem for the Euclidean Laplacian, we analyze the asymptotic behaviour and \(L^p\)-integrability of solutions to the Helmholtz equation \[ Δ_X f + (λ^2 + ρ^2) f = 0 \quad \text{in } Ω, \] where \(λ\in \mathbb{C}\setminus i\mathbb{Z}\) and \(ρ\) denotes the half-sum of positive roots. We establish sharp Rellich-type quantitative \(L^p\)-growth estimates in geodesic annuli, which yield the nonexistence of nontrivial \(L^p(Ω)\)-solutions in the optimal range \(1 \leq p \leq 2\) for spectral parameters satisfying \(|\Im(λ)| \leq (2/p - 1)ρ\). For non-real spectral parameters, we further obtain refined Rellich-type uniqueness results under weak \(L^p\)-assumptions. As a by-product, we also prove a Rellich-type uniqueness theorem in terms of Hardy-type norms. Our results provide a geometric extension of the Euclidean Rellich theorem, highlighting the role of exponential volume growth and the \(p\)-dependence of the \(L^p\)-spectrum of \(Δ_X\) in producing genuinely non-Euclidean spectral phenomena. |
| title | On Rellich-type asymptotics for eigenfunctions on rank one symmetric spaces of noncompact type |
| topic | Analysis of PDEs Classical Analysis and ODEs Primary: 43A85, 35J05, Secondary: 47A75, 58J50 |
| url | https://arxiv.org/abs/2511.12561 |