2 papers
gr-qc2026
Rigidity aspects of a cosmological singularity theorem
Eric Ling, Carl Rossdeutscher, Walter Simon +1
Improving a singularity theorem in General Relativity by Galloway and Ling we show the following (cf.\ Theorem 1): If a globally hyperbolic spacetime satisfying the null energy…
gr-qc2025
Marginally outer trapped tubes in de Sitter spacetime
Marc Mars, Walter Simon, Roland Steinbauer +1
We prove two results which are relevant for constructing marginally outer trapped tubes (MOTTs) in de Sitter spacetime. The first one holds more generally, namely for spacetimes sa…