A class of compact Poincare-Einstein manifolds: properties and construction

Details A class of compact Poincare-Einstein manifolds: properties and construction A class of compact Poincare-Einstein manifolds: properties and construction

2008-08-15

arxiv.org/abs/0808.2097v1

Mathematics

Differential Geometry

28 pages

Scientific paper

We develop a geometric and explicit construction principle that generates classes of Poincare-Einstein manifolds, and more generally almost Einstein manifolds. Almost Einstein manifolds satisfy a generalisation of the Einstein condition; they are Einstein on an open dense subspace and, in general, have a conformal scale singularity set that is a conformal infinity for the Einstein metric. In particular, the construction may be applied to yield families of compact Poincare-Einstein manifolds, as well as classes of almost Einstein manifolds that are compact without boundary. We obtain classification results which show that the construction essentially exhausts a class of almost Einstein (and Poincare-Einstein) manifold. We develop the general theory of fixed conformal structures admitting multiple compatible almost Einstein structures. We also show that, in a class of cases, these are canonically related to a family of constant mean curvature totally umbillic embedded hypersurfaces.

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