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arXiv 2407.06949math.FA
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一类Dunkl波动方程的衰减估计

Decay estimates for a class of Dunkl wave equations

Cheng Luo, Shyam Swarup Mondal, Manli Song

AI总结:

本文针对Dunkl拉普拉斯算子相关的色散半群,通过频率局部化方法得到衰减估计,统一推广了已知色散估计结果,并证明了两类非线性方程小初值解的全局存在性。

摘要:

设$\Delta_\kappa$为$\mathbb{R}^n$上的Dunkl拉普拉斯算子,$\phi: \mathbb{R}^+ \to \mathbb{R}$为光滑函数。本文的研究目标有两重。首先,我们研究形如$e^{it\phi(\sqrt{-\Delta_\kappa})}$的一类色散半群的衰减估计,通过频率局部化方法克服了$\phi$的非齐次性带来的困难。作为应用,在论文的第二部分,我们建立了与Dunkl拉普拉斯算子$\Delta_k$相关的若干具体波动方程的Strichartz估计,对应$\phi(r)=r、r^2、r^2+r^4、\sqrt{1+r^2}、\sqrt{1+r^4}$以及$r^\mu(0<\mu\leq2, \mu\neq1)$的情形。更准确地说,我们统一并简化了所有已知的色散估计,并将其推广到更一般的情况。最后,利用衰减估计,我们证明了带幂次型非线性项的非线性Klein-Gordon方程和梁方程小初值Sobolev解的全局时间存在性。

英文摘要:

Let $Δ_κ$ be the Dunkl Laplacian on $\mathbb{R}^n$ and $ϕ: \mathbb{R}^+ \to \mathbb{R}$ is a smooth function. The aim of this manuscript is twofold. First, we study the decay estimate for a class of dispersive semigroup of the form $e^{itϕ(\sqrt{-Δ_κ})}$.W e overcome the difficulty arising from the non-homogeneousity of $ϕ$ by frequency localization. As applications, in the next part of the paper, we establish Strichartz estimates for some concrete wave equations associated with the Dunkl Laplacian $Δ_k,$ which corresponds to $ϕ(r)=r, r^2, r^2+r^4, \sqrt{1+r^2}, \sqrt{1+r^4}$, and $r^μ,0<μ\leq 2, μ\neq 1$. More precisely, we unify and simplify all the known dispersive estimates and extend to more general cases. Finally, using the decay estimates, we prove the global-in-time existence of small data Sobolev solutions for the nonlinear Klein-Gordon equation and beam equation with the power type nonlinearities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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