20 mars 2019

Hans-Joachim Hein (Fordham University (NY))
The renormalized volume of a 4-dimensional Ricci-flat ALE space

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Lieu : Salle 3L8

Résumé : We introduce a natural definition of the renormalized volume of a 4-dimensional Ricci-flat ALE space. We then prove that the renormalized volume is always less or equal than zero, with equality if and only if the ALE space is isometric to its asymptotic cone. Currently the only known examples of 4-dimensional Ricci-flat ALE spaces are Kronheimer’s gravitational instantons and their quotients, which are also known to be the only possible examples of special holonomy. We calculate the renormalized volume of these spaces in terms of Kronheimer’s period map. This is joint work with Olivier Biquard.

The renormalized volume of a 4-dimensional Ricci-flat ALE space  Version PDF