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Infinity Behavior of BoundedSubharmonic Functions on Ricci Non-negativeManifolds
Authors:Bao?Qiang?Wu  author-information"  >  author-information__contact u-icon-before"  >  mailto:bqwu@pub.xz.jsinfo.net"   title="  bqwu@pub.xz.jsinfo.net"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author
Affiliation:(1) Department of Mathematics, Xuzhou Normal University, Xuzhou, 221009, P. R. China
Abstract:Abstract In this paper, we study the infinity behavior of the bounded subharmonic functions on a Ricci non-negative Riemannian manifold M. We first show that $$
lim _{{r to infty }} frac{{r^{2} }}
{{V{left( r right)}}}{int_{B{left( r right)}} {Delta hdv{kern 1pt}  = {kern 1pt} {kern 1pt} 0} }
$$ if h is a bounded subharmonic function. If we further assume that the Laplacian decays pointwisely faster than quadratically we show that h approaches its supremun pointwisely at infinity, under certain auxiliary conditions on the volume growth of M. In particular, our result applies to the case when the Riemannian manifold has maximum volume growth. We also derive a representation formula in our paper, from which one can easily derive Yau’s Liouville theorem on bounded harmonic functions. Research partially supported by JJNSF JW970052
Keywords:Manifold  Subharmonic function  Ricci curvature  Volume growth
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