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arXiv math/0701335math.AP
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完备流形上热核的Hamilton梯度估计

Hamilton's gradient estimate for the heat kernel on complete manifolds

Brett Kotschwar

摘要:

本文推广了R的一个梯度估计。利用$Rc \geq -Kg$证明了闭流形上热方程的正解到完备非紧流形上有界正解的Hamilton性。我们通过L的一个最大值原理实现了这一推广。Karp和P.Li,以及解的梯度的Bernstein型估计。我们的结果的一个应用,以及P.Li和S.T. Yau给出了具有非负里奇曲率的完备流形的热核的梯度的估计,对于${\mathbb{R}}^n$上的热核,该估计在$t$的阶中是尖锐的。

英文摘要:

In this paper we extend a gradient estimate of R. Hamilton for positive solutions to the heat equation on closed manifolds to bounded positive solutions on complete, non-compact manifolds with $Rc \geq -Kg$. We accomplish this extension via a maximum principle of L. Karp and P. Li and a Bernstein-type estimate on the gradient of the solution. An application of our result, together with the bounds of P. Li and S.T. Yau, yields an estimate on the gradient of the heat kernel for complete manifolds with non-negative Ricci curvature that is sharp in the order of $t$ for the heat kernel on ${\mathbb{R}}^n$.

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