yamabe invariant
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2021 ◽  
Vol 34 (1) ◽  
pp. 1-34
Author(s):  
Kazuo Akutagawa
Keyword(s):  




Author(s):  
Flávio Almeida Lemos ◽  
Ezequiel Barbosa

Let [Formula: see text] be a compact, connected, strictly pseudo-convex CR manifold. In this paper, we give some properties of the CR Yamabe Operator [Formula: see text]. We present an upper bound for the Second CR Yamabe Invariant, when the First CR Yamabe Invariant is negative, and the existence of a minimizer for the Second CR Yamabe Invariant, under some conditions.





2019 ◽  
Vol 21 (05) ◽  
pp. 1850041 ◽  
Author(s):  
Xianfu Liu ◽  
Zuoqin Wang

Let [Formula: see text] be a closed 4-manifold with positive Yamabe invariant and with [Formula: see text]-small Weyl curvature tensor. Let [Formula: see text] be any metric in the conformal class of [Formula: see text] whose scalar curvature is [Formula: see text]-close to a constant. We prove that the set of Riemannian metrics in the conformal class [Formula: see text] that are isospectral to [Formula: see text] is compact in the [Formula: see text] topology.







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