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arXiv 1502.06740math.AP
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Neumann热核的高斯上界的观测

Observations on gaussian upper bounds for Neumann heat kernels

Mourad Choulli, Laurent Kayser, El Maati Ouhabaz

摘要:

给定完备黎曼流形$\mathcal{M}$的整环$Ω$,定义$\mathcal{A}$为$Ω$上的具有Neumann边界条件的拉普拉斯算子.证明了在适当的条件下,相应的热核满足高斯上界$$ h(t,x,y)\leq \frac{C}{\left[V\_Ω(x,\sqrt{t})V\_Ω(y,\sqrt{t})\right]^{1/2}}\left( 1+\frac{d^2(x,y)}{4t}\right)^δe^{-\frac{d^2(x,y)}{4t}},\;\; t\textgreater{}0,\; x,y\in Ω. $$这里$d$是$\mathcal{M}$上的测地线距离,$V\_Ω(x,r)$是$B(x,r)\cap Ω$的黎曼体积,其中$B(x,r)$是中心$x$,半径$r$的测地线球,$δ$是与$Ω$的加倍性质有关的常数.作为结果,我们得到了半群$e^{-t {\mathcal A}}$在$L^p(Ω)$上对所有$p \in [1, \infty)$的解析性以及谱乘子结果。

英文摘要:

Given a domain $Ω$ of a complete Riemannian manifold $\mathcal{M}$ and define $\mathcal{A}$ to be the Laplacian with Neumann boundary condition on $Ω$. We prove that, under appropriate conditions, the corresponding heat kernel satisfies the Gaussian upper bound $$ h(t,x,y)\leq \frac{C}{\left[V\_Ω(x,\sqrt{t})V\_Ω(y,\sqrt{t})\right]^{1/2}}\left( 1+\frac{d^2(x,y)}{4t}\right)^δe^{-\frac{d^2(x,y)}{4t}},\;\; t\textgreater{}0,\; x,y\in Ω. $$ Here $d$ is the geodesic distance on $\mathcal{M}$, $V\_Ω(x,r)$ is the Riemannian volume of $B(x,r)\cap Ω$, where $B(x,r)$ is the geodesic ball of center $x$ and radius $r$, and $δ$ is a constant related to the doubling property of $Ω$. As a consequence we obtain analyticity of the semigroup $e^{-t {\mathcal A}}$ on $L^p(Ω)$ for all $p \in [1, \infty)$ as well as a spectral multiplier result.

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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