Vorträge in der Woche 17.11.2014 bis 23.11.2014

Dienstag, 18.11.2014: Relative trace identities II

Michael Füllbier

Donnerstag, 20.11.2014: "Null mean curvature" flow and marginally outer trapped surfaces.

Dr. Theodora Bourni (FU Berlin)

In this talk we discuss a new second order parabolic evolution equation for hypersurfaces in space-time initial data sets, that generalizes mean curvature flow (MCF). In particular, the 'null mean curvature' - a space-time extrinsic curvature quantity - replaces the usual mean curvature in the evolution equation defining MCF. This flow is motivated by the study of black holes and mass/energy inequalities in general relativity. We present a theory of weak solutions using level-set methods and outline a natural application of the flow as a parabolic approach to finding outermost marginally outer trapped surfaces (MOTS), which play the role of quasi-local black hole boundaries in general relativity. This is joint work with Kristen Moore.