Pseudo-harmonic Maps from Complete Noncompact Pseudo-Hermitian Manifolds to Regular Balls

Pseudo-harmonic Maps from Complete Noncompact Pseudo-Hermitian Manifolds to Regular Balls
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从完全非紧伪厄米流形到正则球的伪调和映射

DOI:
10.1007/s12220-019-00206-2
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发表时间:
2018-02
影响因子:
1.1
通讯作者:
Zhang Wei
Zhang Wei
中科院分区:
数学2区
文献类型:
--
作者:
Chong Tian;Dong Yuxin;Ren Yibin;Zhang Wei

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In this paper, we give an estimate of sub-Laplacian of Riemannian distance functions in pseudo-Hermitian geometry which plays a similar role as Laplacian comparison theorem in Riemannian geometry, and deduce a prior horizontal gradient estimate of pseudo-harmonic maps from pseudo-Hermitian manifolds to regular balls of Riemannian manifolds. As an application, Liouville theorem is established under the conditions of nonnegative pseudo-Hermitian Ricci curvature and vanishing pseudo-Hermitian torsion. Moreover, we obtain the existence of pseudo-harmonic maps from complete noncompact pseudo-Hermitian manifolds to regular balls of Riemannian manifolds.
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