Spectral characterization of Poincaré-Einstein manifolds with infinity of positive Yamabe type

Details Spectral characterization of Poincaré-Einstein manifolds with infinity of positive Yamabe type Spectral characterization of Poincaré-Einstein manifolds with infinity of positive Yamabe type

2009-09-17

arxiv.org/abs/0909.3207v1

Mathematics

Differential Geometry

16 pages

Scientific paper

In this paper, we give a sharp spectral characterization of conformally compact Einstein manifolds with conformal infinity of positive Yamabe type in dimension $n+1>3$. More precisely, we prove that the largest real scattering pole of a conformally compact Einstein manifold $(X,g)$ is less than $\ndemi -1$ if and only if the conformal infinity of $(X,g)$ is of positive Yamabe type. If this positivity is satisfied, we also show that the Green function of the fractional conformal Laplacian $P(\alpha)$ on the conformal infinity is non-negative for all $\alpha\in [0, 2]$.

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