The annoying null boundaries
Piotr T. Chru\'sciel, Paul Klinger

TL;DR
This paper investigates the boundary properties of certain expanding singularity space-times, proving the non-existence of continuous extensions across compact boundaries and characterizing the boundary as null where differentiable.
Contribution
It establishes new results on the boundary structure of expanding singularity space-times, particularly regarding extension impossibility and boundary nullity in non-compact cases.
Findings
No $C^0$-extensions across compact boundaries exist.
Boundaries are null where differentiable in non-compact space-times.
Results apply under specific assumptions on expanding singularities.
Abstract
We consider a class of globally hyperbolic space-times with "expanding singularities". Under suitable assumptions we show that no -extensions across a compact boundary exist, while the boundary must be null wherever differentiable (which is almost everywhere) in the non-compact case.
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