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arXiv 0811.1200math.DGmath.AP
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完备流形上具有正谱的泊松方程及其应用

The Poisson equation on complete manifolds with positive spectrum and applications

Ovidiu Munteanu, Natasa Sesum

摘要:

本文研究了具有正谱和里奇曲率的完备流形上的泊松方程解的存在性.我们证明了如果一个函数$f$对于某个$\varepsilon >0,$有衰减$f=O(r^{-1-\varepsilon}) $,其中$r$是到一个不动点的距离函数,那么泊松方程$Δu=f$有一个解$u$至多有指数增长性.我们将这个结果应用到泊松方程上,研究了完备流形上调和映射的存在性以及完备流形上全纯向量丛上Hermitian Einstein度量的存在性,从而推广了Li-Tam和Ni的一些结果.假设流形是单连通的,且里奇曲率在两个负常数之间,我们可以证明泊松方程确实有界解,并将这个结果应用于完备曲面上的Ricci流.

英文摘要:

In this paper we investigate the existence of a solution to the Poisson equation on complete manifolds with positive spectrum and Ricci curvature bounded from below. We show that if a function $f$ has decay $f=O(r^{-1-\varepsilon}) $ for some $\varepsilon >0,$ where $r$ is the distance function to a fixed point, then the Poisson equation $Δu=f$ has a solution $u$ with at most exponential growth. We apply this result on the Poisson equation to study the existence of harmonic maps between complete manifolds and also existence of Hermitian Einstein metrics on holomorphic vector bundles over complete manifolds, thus extending some results of Li-Tam and Ni. Assuming that the manifold is simply connected and of Ricci curvature between two negative constants, we can prove that in fact the Poisson equation has a bounded solution and we apply this result to the Ricci flow on complete surfaces.

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