Escobar–Yamabe compactifications for Poincaré–Einstein manifolds and rigidity theorems

Escobar–Yamabe compactifications for Poincaré–Einstein manifolds and rigidity theorems
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庞加莱-爱因斯坦流形和刚性定理的 Escobar-Yamabe 紧化

DOI:
10.1016/j.aim.2018.11.005
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发表时间:
2017-12
影响因子:
1.7
通讯作者:
Fang Wang
Fang Wang
中科院分区:
数学1区
文献类型:
--
作者:
Xuezhang Chen;Mijia Lai;Fang Wang

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设(Xn,g+)(n≥3)是C3的α共形紧的Poincaré-Einstein型流形(∂X,[gˆ]).在通过边界定义函数‾的共形紧化(X‾,∂,g‘=Yamabe 2g+)上,有两种类型的Yamabe常数:Y(X‾,∂X,[g’])和Q(X‾,∂X,[g‘])。(见定义(1)和(2)。)在[13]中,Gursky和han得到了Y(X‾,∂X,[g‘])与Y(∂X,[gˆ])之间的一个不等式。本文首先证明了Gursky-han不等式成立的充要条件是(Xn,g+)等距于标准双曲空间(Hn,gH)。其次,我们导出了Q(X‾,∂X,[g‘])与Y(∂X,[gˆ])之间的一个共形不变不等式,并证明了这个等式成立的充要条件是(Xn,g+)与(Hn,gH)等距。在此基础上,给出了共形无穷远与标准球面共形等价的Poincaré-Einstein流形的刚性定理的一个简单证明。
Abstract Let (X n, g+)(n≥ 3) be a Poincaré–Einstein manifold which is C 3, α conformally compact with conformal infinity (∂ X,[g ˆ]). On the conformal compactification (X‾, g¯= ρ 2 g+) via a boundary defining function ρ, there are two types of Yamabe constants: Y (X‾,∂ X,[g¯]) and Q (X‾,∂ X,[g¯]).(See definitions (1) and (2).) In [13], Gursky and Han obtained an inequality between Y (X‾,∂ X,[g¯]) and Y (∂ X,[g ˆ]). In this paper, we first show that the equality holds in Gursky–Han's inequality if and only if (X n, g+) is isometric to the standard hyperbolic space (H n, g H). Secondly, we derive a conformal invariant inequality between Q (X‾,∂ X,[g¯]) and Y (∂ X,[g ˆ]), and show the equality holds if and only if (X n, g+) is isometric to (H n, g H). Based on this, we give a simple proof of the rigidity theorem for Poincaré–Einstein manifolds with conformal infinity being conformally equivalent to the standard sphere.
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