Sp(2)/U(1) and a positive curvature problem
Sp(2)/U(1) and a positive curvature problem
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Sp(2)/U(1) 和正曲率问题
DOI:
10.1016/j.difgeo.2015.08.002
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发表时间:
2015-02
影响因子:
0.5
通讯作者:
Wolf, Joseph A.
中科院分区:
文献类型:
--
作者:
Xu, Ming;Wolf, Joseph A.
A compact Riemannian homogeneous space G/H, with a bi-invariant orthogonal decomposition g= h+ m is called positively curved for commuting pairs, if the sectional curvature vanishes for any tangent plane in T eH (G/H) spanned by a linearly independent commuting pair in m. In this paper, we will prove that on the coset space Sp (2)/U (1), in which U (1) corresponds to a short root, admits positively curved metrics for commuting pairs. B. Wilking recently proved that this Sp (2)/U (1) cannot be positively curved in the general sense. This is the first example to distinguish the set of compact coset spaces admitting positively curved metrics, and that for metrics positively curved only for commuting pairs.
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影响因子:
4.9
作者:
N. Wallach
通讯作者:
N. Wallach
影响因子:
1.4
作者:
Scuola Normale Superiore;M. Berger;Varietes Riemanniennes;Homogenes Normales
通讯作者:
Scuola Normale Superiore;M. Berger;Varietes Riemanniennes;Homogenes Normales
DOI:
--
发表时间:
2014-07
期刊:
arXiv: Differential Geometry
影响因子:
--
作者:
Ming Xu;Shaoqiang Deng;Libing Huang;Zhiguang Hu
通讯作者:
Ming Xu;Shaoqiang Deng;Libing Huang;Zhiguang Hu
影响因子:
0.7
作者:
Ming Xu;Shaoqiang Deng
通讯作者:
Ming Xu;Shaoqiang Deng
影响因子:
1.3
作者:
Simon Aloff;N. Wallach
通讯作者:
Simon Aloff;N. Wallach