Canonical contact forms on spherical CR manifolds

Canonical contact forms on spherical CR manifolds
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球形 CR 流形上的规范接触形式

DOI:
10.1007/s10097-003-0050-8
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发表时间:
2003-03
期刊:
Journal of the European Mathematical Society, Vol. 5, No.3 (SCI)
影响因子:
--
通讯作者:
王伟
王伟
中科院分区:
其他
文献类型:
--
作者:
王伟

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我们在标量阳性球形CR歧管(M,J)上构建CR不变的典型接触形式CAN(J),这是由Habermann和Jost构建的局部合成平坦的歧管上的典型指标的CR类似物。我们还构建了另一个独立
We construct the CR invariant canonical contact form can(J) on scalar positive spherical CR manifold (M,J), which is the CR analogue of canonical metric on locally conformally flat manifold constructed by Habermann and Jost. We also construct another canonical contact form on the Kleinian manifold Ω(Γ)/Γ, where Γ is a convex cocompact subgroup of AutCRS2n+1=PU(n+1,1) and Ω(Γ) is the discontinuity domain of Γ. This contact form can be used to prove that Ω(Γ)/Γ is scalar positive (respectively, scalar negative, or scalar vanishing) if and only if the critical exponent δ(Γ)<n(respectively, δ(Γ)>n, or δ(Γ)=n). This generalizes Nayatani’s result for convex cocompact subgroups ofSO(n+1,1). We also discuss the connected sum of spherical CR manifolds.
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