# Mathematics Colloquia and Seminars

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### Compactification and Einstein metrics

**Geometry/Topology**

Speaker: | Rod Gover, University of Auckland |

Location: | 2112 MSB |

Start time: | Tue, Nov 12 2013, 4:10PM |

Conformal compactification, as originally defined by Penrose, has long been recognised as an effective geometric framework for relating conformal geometry, and associated field theories ``at infinity'', to the asymptotic phenomena of an interior (pseudo-)-Riemannian geometry of one higher dimension. It provides an effective approach for analytic problems in GR, geometric scattering, conformal invariant theory, as well as the AdS/CFT correspondence of Physics. For many of these applications it should be profitable to consider other notions of geometric compactification. For manifolds $M$ with a complete affine connection $\nabla$, I will define a class of compactifications based around projective geometry (that is the geodesic path structure of $\nabla$). This applies to pseudo-Riemannian geometry via the Levi-Civita connection and provides an effective alternative to conformal compactification. The construction is linked to the solutions of overdetermined PDE known as BGG equations and via this is seen to a part of a very general picture. This shows how the geometry of the interior structure determines the topology and geometry of the set at infinity. This is joint work with Andreas Cap.