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gr-qc2023★ 5 cited
Some new perspectives on the Kruskal--Szekeres extension with applications to photon surfaces
Carla Cederbaum, Markus Wolff
It is a well-known fact that the Schwarzschild spacetime admits a maximal spacetime extension in null coordinates which extends the exterior Schwarzschild region past the Killing h…
math.DG2023
On effects of the null energy condition on totally umbilic hypersurfaces in a class of static spacetimes
Markus Wolff
We study the effects of the null energy condition on totally umbilic hypersurfaces in a class of static spacetimes, both in the spacelike and the timelike case, respectively. In th…