首页> 外文期刊>Differential geometry and its applications >Curvature properties of the positively curved Eschenburg spaces
【24h】

Curvature properties of the positively curved Eschenburg spaces

机译:正弯曲的Eschenburg空间的曲率性质

获取原文
获取原文并翻译 | 示例
           

摘要

Using a Cheeger construction, we enlarge the known one parameter family of metrics of positive curvature on the Eschenburg spaces to a simple explicit four parameter family. Then we show in a smaller class of metrics that all of the Eschenburg spaces of positive curvature have their pinching bounded above by 1/37. Since the Aloff–Wallach spaces are the homogeneous Eschenburg spaces and since Puttmann has calculated the pinching of W_(1,1) = SU(3)/S_(1,1)~1 in the U(2) biinvariant metric to be exactly 1/37 this upper bound is sharp. It is also shown that the only Eschenburg space with pinching exactly 1/37 is W_(1,1).
机译:使用Cheeger构造,我们将Eschenburg空间上已知的正曲率度量的一个参数族扩展为一个简单的显式四参数族。然后,我们在较小的度量标准类别中显示所有正曲率的Eschenburg空间的捏合度都超出了1/37。由于Aloff–Wallach空间是齐次Eschenburg空间,并且由于Puttmann计算出U(2)双不变度量中W_(1,1)= SU(3)/ S_(1,1)〜1的捏合正好1/37这个上限是尖锐的。还表明,精确捏合1/37的唯一Eschenburg空间是W_(1,1)。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号