23.04.2025, 14:00 - 15:00
– Campus Golm, Building 10, Room 2.10.0.25
Informationsveranstaltung
Zentrale Arbeitsschutzunterweisung / Work safety instructions
Frau Zilm (Bereich Sicherheitswesen)
Markus Wolff
We study the effects of the null energy condition on both spacelike and timelike umbilical hypersurfaces in a class of static spacetimes. In the spacelike case, we study umbilical warped product graphs and give a full characterization of embedded surfaces with constant spacetime mean curvature using an Alexandrov Theorem by Brendle. In the timelike case, we achieve a characterization of photon surfaces with constant umbilicity factor similar to a recent result by Cederbaum and Galloway.