45 citations · 76 across the 11 of their papers we have counts for
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gr-qc2024★ 1 cited
A brief introduction to non-regular spacetime geometry
Clemens Sämann
We give a brief non-technical introduction to non-regular spacetime geometry. In particular, we discuss how curvature, and hence gravity, can be defined without a smooth (different…
gr-qc2019★ 11 cited
Cut-and-paste for impulsive gravitational waves with : The geometric picture
Jiri Podolsky, Clemens Sämann, Roland Steinbauer +1
Impulsive gravitational waves in Minkowski space were introduced by Roger Penrose at the end of the 1960s, and have been widely studied over the decades. Here we focus on non-expan…
gr-qc2014★ 17 cited
The global existence, uniqueness and C^1-regularity of geodesics in nonexpanding impulsive gravitational waves
Jiri Podolsky, Clemens Sämann, Roland Steinbauer +1
We study geodesics in the complete family of nonexpanding impulsive gravitational waves propagating in spaces of constant curvature, that is Minkowski, de Sitter and anti-de Sitter…