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Journal of Geometry and Physics
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Journal of Geometry and Physics
Article . 2010 . Peer-reviewed
License: Elsevier Non-Commercial
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Article . 2010
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The collapsing sphere product of Poincaré–Einstein spaces

The collapsing sphere product of Poincaré-Einstein spaces
Authors: Leitner, Felipe;

The collapsing sphere product of Poincaré–Einstein spaces

Abstract

Every smooth even asymptotically hyperbolic space \(\bar{M}\) with boundary can be doubled through a natural procedure, producing a smooth conformal manifold without boundary. In the case of a Poincaré-Einstein metric, this doubling leads to an Einstein manifold with hypersurface singularity. In the present article, the author generalizes this construction to what is called a collapsing sphere product \(D_\ell \bar{M}\) or \(S^\ell\)-doubling and investigates geometric properties of this construction when applied to even asymptotically hyperbolic Einstein spaces. Roughly, the space \(D_\ell \bar{M}\) is obtained by identifying at each boundary point of \(\bar{M}\) the sphere \(S^\ell\) in the product \(S^\ell \times \bar{M}\) with a single point. The collapsing sphere product \(D_\ell H^{n+1}\) of the Poincaré model of hyperbolic space \(H^{n+1}\) is conformally equivalent to the Möbius sphere of the corresponding dimension. The author shows that the \(S^\ell\)-doubling of an even asymptotically hyperbolic Einstein space admits multiple almost Einstein structures with intersecting scale singularities and decomposable conformal holonomy. The pole of \(D_\ell\bar{M}\) is shown to be a totally umbilical submanifold. The author also presents explicit constructions of a Poincaré-Einstein metric and a Fefferman-Graham ambient metric for \(D_\ell\bar{M}\).

Related Organizations
Keywords

Special Riemannian manifolds (Einstein, Sasakian, etc.), Poincaré-Einstein metric, Fefferman-Graham metric, doubling construction, Conformal differential geometry, asymptotically hyperbolic space

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
Average
Average
hybrid