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math.DG2026
The alignment time function
Marco van den Beld-Serrano
Given a fixed past-directed timelike vector field, does there exist a time function whose gradient is optimally aligned with it? We address this question by introducing a functiona…
math.DG2024
-inextendibility of FLRW spacetimes within a subclass of axisymmetric spacetimes
Melanie Graf, Marco van den Beld-Serrano
Starting from the proof of the -inextendibility of Schwarzschild by Sbierski, the past decade has seen renewed interest in showing low-regularity inextendibility for known spa…