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        One Nonparabolic End Theorem on K¨ahler Manifolds

        2014-03-03 03:34:59

        (School of Mathematics and Physics,Jiangsu University of Technology, Changzhou,Jiangsu,213001)

        One Nonparabolic End Theorem on K¨ahler Manifolds

        ZHU PENG

        (School of Mathematics and Physics,Jiangsu University of Technology, Changzhou,Jiangsu,213001)

        Communicated by Yin Jing-xue

        In this paper,the complete noncompact K¨ahler manifolds satisfying the weighted Poincar′e inequality are considered and one nonparabolic end theorem which generalizes Munteanu’s result is obtained.

        nonparabolic end,weighted Poincar′e inequality,K¨ahler manifold

        1 Introduction

        holds for all compactly supported piecewise smooth functionswhereare all compactly supported piecewise smooth functions on M.(M,ds2)is said to satisfy property(Pρ)if M satis fi es a weighted Poincar′e inequality with ρ and ρds2being complete. Obviously,the notion of the property(Pρ)is a generalization of λ1(M)>0.Li and Wang considered a class of Riemannian manifolds of dimension n≥4 satisfying the property(Pρ) and having the Ricci curvature bounded below in terms of the weight function and gave arigidity theorem if ρ grows no more than exponential increase(see Theorem 5.2 in[3]).Later, Cheng and Zhou[4]obtained a result which generalized Theorem 5.2 in[3].Considering the manifolds satisfying property(Pρ)for a weight function ρ that has limit zero at in fi nity,i.e.,=0,Li and Wang[3]proved that for n≥4 and the Ricci curvature RicM(x)of M being bounded from below byfor each x∈M,the Riemannian manifold has only one nonparabolic end.In the setting of K¨ahler manifolds case,Munteanu[5]obtained analogous result to that for Riemannian manifolds,i.e.,a K¨ahler manifold M2n(n≥2)has only one nonparabolic end if the Ricci curvature RicM(x)of M is bounded from below by?4ρ(x)for each x∈M.

        In this paper,the case of K¨ahler manifold is considered.Following the idea of Cheng and Zhou[4],a generalized theorem which contains the result of Munteanu[5]is obtained.More precisely,we have

        Theorem 1.1LetMbe a complete noncompact real2n-dimensional K¨ahler manifold with property(Pρ)(n≥2).Suppose that the Ricci curvature ofMsatis fi es

        where the non-negative bounded functionτ(x)satis fi es Poincar′e’s inequality

        thenMhas only one nonparabolic end.

        Remark 1.1If we choose τ=ρ in Theorem 1.1,then it is just Munteanu’s result,that is,Theorem 1 in[5].

        2 Proof of the Main Result

        Assume by absurd that M had at least two non parabolic ends,and thus there would exist a bounded harmonic function f with fi nite Dirichlet integral on M(see[6]).Moreover,we can assume that inf f=0 and supf=1 with in fi mum and supremum achieved at in fi nity of nonparabolic end E and F=ME,respectively.One has the improved Bochner formula for the function f∶

        Lemma 2.1Letg=hφ(f)withφ∶(0,1)→(0,+∞)being aC∞function which is to be determined later.Then

        Proof.A direct computation shows that

        Lemma 2.2There exists the following inequality∶

        Proof.Since

        and

        it follows that

        Let

        where

        Suppose that the right hand side of(2.3)vanishes as ?→1.It implies that

        that is,f is a constant function.It contradicts the assumption.Therefore,M has only one nonparabolic end.Now,choose

        Thus,

        It suffices to prove the following lemma∶

        Lemma 2.3AandBvanish if→1.

        Proof.We only prove the conclusions for A1and B1.The proofs for A2and B2are similar. Chooseas follows∶

        where

        Now we prove the following fact∶

        for all R>0(see[8]).Let

        Then

        Fix x∈M and consider the function

        Obviously,η(r)tends to a negative number as r→0 and tends to+∞as r→+∞.Thus, there exists an r0depending on x such that

        Hence,

        For any y∈B(x,r0),let γ be a minimizing geodesic with respect to the background metric ds2jointing x and y.Then

        which implies that B(x,r0)?Bρ(x,1).Hence,

        Thus,for any x∈Bρ(R)∩L(σ?,?),

        where

        Note that the assumption on ρ and τ implies that

        Recall that,under the assumption that the complete manifold M has the property(Pρ), one has the decay estimation for f(see(2.10)in[2])∶

        Thus,

        In addition,we have

        Similarly,there is

        where the last inequality holds because of Corollary 2.3 of[2],

        Note that there is the following inequality from Bochner’s formula∶

        Suppose that

        Thus,

        So,

        where the last inequality holds because of Corollary 2.3 of[2].Combining(2.10)–(2.20), letting R→∞and δ,?→0,we obtain that A and B vanish.

        [1]Li P,Wang J P.Complete manifolds with positive spectrum I.J.Di ff erential Geom.,2001,58: 501–534.

        [2]Li P,Wang J P.Complete manifolds with positive spectrum II.J.Di ff erential Geom.,2002,62: 143–162.

        [3]Li P,Wang J P.Weighted Poincar′e inequality and rigidity of complete manifolds.Ann.Sci. ′Ecole Norm.Sup.,2006,39:921–982.

        [4]Cheng X,Zhou D T.Manifolds with weighted Poincar′e inequality and uniqueness of minimal hypersurfaces.Comm.Anal.Geom.,2009,17(1):135–154.

        [5]Munteanu O.Two results on the weighted Poincar′e inequality on complete K¨ahler manifolds. Math.Res.Lett.,2007,14:995–1008.

        [6]Li P,Tam L F.Harmonic functions and the structure of complete manifolds.J.Di ff erential Geom.,1992,35:359–383.

        [7]Lam K H.Results on a weighted Poincar′e inequality of complete manifolds.Trans.Amer.Math. Soc.,2010,362:5043–5062.

        [8]Cheng S Y,Yau S T.Di ff erential equations on Riemannian manifolds and their geometric applications.Comm.Pure Appl.Math.,1975,28:333–354.

        tion:53C21,54C42

        A

        1674-5647(2014)03-0237-08

        10.13447/j.1674-5647.2014.03.05

        Received date:May 16,2011.

        Foundation item:The NSF(11101352)of China,New Century Talent Project of Yangzhou University,Fund of Jiangsu University of Technology(KYY 13005)and Qing Lan Project.

        E-mail address:zhupeng2004@126.com(Zhu P).

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