Sharp $L^p$-estimates for wave equation on $ax+b$ groups
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arXiv
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| Natura: | Preprint |
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2025
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| _version_ | 1866918067306496000 |
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| author | Wang, Yunxiang Yan, Lixin |
| author_facet | Wang, Yunxiang Yan, Lixin |
| contents | Let $G$ be the group $\mathbb{R}_+\ltimes \mathbb{R}^n$ endowed with Riemannian symmetric space metric $d$ and the right Haar measure $\mathrm{d} ρ$ which is of $ax+b$ type, and $L$ be the positive definite distinguished left invariant Laplacian on $G$. Let $u=u(t,\cdot)$ be the solution of $u_{tt}+Lu=0$ with initial conditions $u|_{t=0}=f$ and $u_t|_{t=0}=g$. In this article we show that for a fixed $t \in{\mathbb R}$ and every $1<p<\infty$, \begin{align*} \|u(t,\cdot)\|_{L^p(G)}\leq C_p\Big( (1+|t|)^{2|1/p-1/2|}\|f\|_{L^p_{α_0}(G)}+(1+|t|)\,\|g\|_{L^p_{α_1}(G)}\Big) \end{align*} if and only if \begin{align*} α_0\geq n\left|{1\over p}- {1\over2}\right| \quad \mbox{and} \quad α_1\geq n\left|{1\over p}- {1\over2}\right| -1. \end{align*} This gives an endpoint result for $α_0=n|1/p-1/2|$ and $α_1=n|1/p-1/2|-1$ with $1<p<\infty$ in Corollary 8.2, as pointed out in Remark 8.1 due to Müller and Thiele [Studia Math. \textbf{179} (2007)]. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_17531 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Sharp $L^p$-estimates for wave equation on $ax+b$ groups Wang, Yunxiang Yan, Lixin Classical Analysis and ODEs Analysis of PDEs 43A85, 22E30, 42B15, 35L20 Let $G$ be the group $\mathbb{R}_+\ltimes \mathbb{R}^n$ endowed with Riemannian symmetric space metric $d$ and the right Haar measure $\mathrm{d} ρ$ which is of $ax+b$ type, and $L$ be the positive definite distinguished left invariant Laplacian on $G$. Let $u=u(t,\cdot)$ be the solution of $u_{tt}+Lu=0$ with initial conditions $u|_{t=0}=f$ and $u_t|_{t=0}=g$. In this article we show that for a fixed $t \in{\mathbb R}$ and every $1<p<\infty$, \begin{align*} \|u(t,\cdot)\|_{L^p(G)}\leq C_p\Big( (1+|t|)^{2|1/p-1/2|}\|f\|_{L^p_{α_0}(G)}+(1+|t|)\,\|g\|_{L^p_{α_1}(G)}\Big) \end{align*} if and only if \begin{align*} α_0\geq n\left|{1\over p}- {1\over2}\right| \quad \mbox{and} \quad α_1\geq n\left|{1\over p}- {1\over2}\right| -1. \end{align*} This gives an endpoint result for $α_0=n|1/p-1/2|$ and $α_1=n|1/p-1/2|-1$ with $1<p<\infty$ in Corollary 8.2, as pointed out in Remark 8.1 due to Müller and Thiele [Studia Math. \textbf{179} (2007)]. |
| title | Sharp $L^p$-estimates for wave equation on $ax+b$ groups |
| topic | Classical Analysis and ODEs Analysis of PDEs 43A85, 22E30, 42B15, 35L20 |
| url | https://arxiv.org/abs/2506.17531 |