On uniqueness of conformally compact Einstein metrics with homogeneous conformal infinity

On uniqueness of conformally compact Einstein metrics with homogeneous conformal infinity
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齐次共形无穷的共形紧爱因斯坦度量的唯一性

DOI:
10.1016/j.aim.2018.10.027
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发表时间:
2016-12
影响因子:
1.7
通讯作者:
Gang Li
Gang Li
中科院分区:
数学1区
文献类型:
--
作者:
Gang Li

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本文证明了对于S 3上的Berger度量gˆ,以(S 3,[gˆ])为共形无穷远的4球B1(0)上的非正曲线共形紧Einstein度量在等距意义下是唯一的,它是Pedersen[21]构造的度量.特别地,由于我们在[18]中证明了如果共形无穷大Y(S 3,[gˆ])的Yamabe常数接近于圆球的Yamabe常数,则填充的任何共形紧的爱因斯坦流形一定是负弯曲的且单连通的,因此,如果gˆ是S 3上的Berger度量,且Y(S 3,[gˆ])接近于圆度量,则填充的共形紧Einstein度量在等距意义下是唯一的。
In this paper we show that for a Berger metric g ˆ on S 3, the non-positively curved conformally compact Einstein metric on the 4-ball B 1 (0) with (S 3,[g ˆ]) as its conformal infinity is unique up to isometries and it is the metric constructed by Pedersen [21]. In particular, since in [18], we proved that if the Yamabe constant of the conformal infinity Y (S 3,[g ˆ]) is close to that of the round sphere then any conformally compact Einstein manifold filled in must be negatively curved and simply connected, therefore if g ˆ is a Berger metric on S 3 with Y (S 3,[g ˆ]) close to that of the round metric, the conformally compact Einstein metric filled in is unique up to isometries.
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