On function spaces for radial functions
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866929467356610560 |
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| author | Groves, Mark D. Hill, Dan J. |
| author_facet | Groves, Mark D. Hill, Dan J. |
| contents | This paper is concerned with complex Banach-space valued functions of the form $$ \hat{f}_k(r\cosθ,r\sinθ,z)=\mathrm{e}^{\mathrm{i} k θ}f_k(r,z), \qquad r \in [0,\infty), θ\in \mathbb{T}^1, z \in \mathbb{R}, $$ for some $k \in \mathbb{Z}$. It is demonstrated how classical and Sobolev spaces for the radial function $f_k$ can be constructed in a natural fashion from the corresponding standard function spaces for $\hat{f}_k$. A theory of radial distributions is derived in the same spirit. Finally, a new class of \textit{Hankel spaces} for the case $f_k=f_k(r)$ is introduced. These spaces are the radial counterparts of the familiar Bessel-potential spaces for functions defined on $\mathbb{R}^d$. The paper concludes with an application of the theory to the Dirichlet boundary-value problem for Poisson's equation in a cylindrical domain. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09372 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On function spaces for radial functions Groves, Mark D. Hill, Dan J. Functional Analysis Analysis of PDEs This paper is concerned with complex Banach-space valued functions of the form $$ \hat{f}_k(r\cosθ,r\sinθ,z)=\mathrm{e}^{\mathrm{i} k θ}f_k(r,z), \qquad r \in [0,\infty), θ\in \mathbb{T}^1, z \in \mathbb{R}, $$ for some $k \in \mathbb{Z}$. It is demonstrated how classical and Sobolev spaces for the radial function $f_k$ can be constructed in a natural fashion from the corresponding standard function spaces for $\hat{f}_k$. A theory of radial distributions is derived in the same spirit. Finally, a new class of \textit{Hankel spaces} for the case $f_k=f_k(r)$ is introduced. These spaces are the radial counterparts of the familiar Bessel-potential spaces for functions defined on $\mathbb{R}^d$. The paper concludes with an application of the theory to the Dirichlet boundary-value problem for Poisson's equation in a cylindrical domain. |
| title | On function spaces for radial functions |
| topic | Functional Analysis Analysis of PDEs |
| url | https://arxiv.org/abs/2403.09372 |