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arXiv 1009.0604math.DG
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流形上简单非线性heat equation的梯度估计

Gradient estimates for a simple nonlinear heat equation on manifolds

Li Ma

摘要:

本文在维数为$n$且具有非负Ricci曲率的紧致黎曼流形$(M,g)$上研究了如下非线性热方程问题$$ u_t-Δu=au\log u+Vu, \ \ u>0 $$正解的梯度估计.这里$a\leq 0$是一个常数,$V$是$M$上的一个光滑函数,其中$-ΔV\leq A$为某个正常数$A$。该热方程是一个基本的发展方程,它可以看作是对$W$ -泛函(由G.Perelman引入)的负梯度热流,$W$-泛函是黎曼流形上的Log-Sobolev不等式,$V$对应于标量曲率。

英文摘要:

In this paper, we study the gradient estimate for positive solutions to the following nonlinear heat equation problem $$ u_t-Δu=au\log u+Vu, \ \ u>0 $$ on the compact Riemannian manifold $(M,g)$ of dimension $n$ and with non-negative Ricci curvature. Here $a\leq 0$ is a constant, $V$ is a smooth function on $M$ with $-ΔV\leq A$ for some positive constant $A$. This heat equation is a basic evolution equation and it can be considered as the negative gradient heat flow to $W$-functional (introduced by G.Perelman), which is the Log-Sobolev inequalities on the Riemannian manifold and $V$ corresponds to the scalar curvature.

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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