arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.3849math.DG
收藏

黎曼流形上的微分Harnack不等式I:线性heat equation

Differential Harnack inequalities on Riemannian manifolds I : linear heat equation

Junfang Li, Xiangjin Xu

摘要:

本文的第一部分利用$Ricci(M)\ge -k$,$k\in \mathbb R$得到了黎曼流形上热方程正解的新的Li-Yau型梯度估计.作为应用,得到了几个抛物型Harnack不等式,并由此得到了具有里奇曲率的流形的热核的新估计.第二部分利用$Ricci(M)\ge -k$建立了流形上热核的Perelman型Li-Yau-Hamilton微分Harnack不等式,推广了L.我是\cite{NL1,NL4}。作为应用,我们得到了一般流形上新的Harnack不等式和热核估计.我们还得到了所有紧黎曼流形的各种熵单调性公式。

英文摘要:

In the first part of this paper, we get new Li-Yau type gradient estimates for positive solutions of heat equation on Riemmannian manifolds with $Ricci(M)\ge -k$, $k\in \mathbb R$. As applications, several parabolic Harnack inequalities are obtained and they lead to new estimates on heat kernels of manifolds with Ricci curvature bounded from below. In the second part, we establish a Perelman type Li-Yau-Hamilton differential Harnack inequality for heat kernels on manifolds with $Ricci(M)\ge -k$, which generalizes a result of L. Ni \cite{NL1,NL4}. As applications, we obtain new Harnack inequalities and heat kernel estimates on general manifolds. We also obtain various entropy monotonicity formulas for all compact Riemannian manifolds.

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。

↑