Isoparametric foliation and a problem of Besse on generalizations of Einstein condition

Isoparametric foliation and a problem of Besse on generalizations of Einstein condition
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等参叶化和爱因斯坦条件推广的贝斯问题

DOI:
10.1016/j.aim.2015.09.003
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发表时间:
2013-07
影响因子:
1.7
通讯作者:
Wenjiao Yan
Wenjiao Yan
中科院分区:
数学1区
文献类型:
--
作者:
Zizhou Tang;Wenjiao Yan

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球面中g= 4的等参超曲面的焦点集都是Willmore子流形,它们是极小的,但大多不是爱因斯坦子流形[25],[22]。灵感来自A。Gray的观点,本文表明,这些焦点集都是A-流形,但很少Ricci平行,除了可能是唯一的未分类的情况。作为一个副产品,它给出了无限多个简单连接的例子,以问题16.56(i)的贝塞关于推广的爱因斯坦条件。
The focal sets of isoparametric hypersurfaces in spheres with g= 4 are all Willmore submanifolds, being minimal but mostly non-Einstein [25],[22]. Inspired by A. Gray's view, the present paper shows that these focal sets are all A-manifolds but rarely Ricci parallel, except possibly for the only unclassified case. As a byproduct, it gives infinitely many simply-connected examples to the problem 16.56 (i) of Besse concerning generalizations of the Einstein condition.
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