The annoying null boundaries
classification
🌀 gr-qc
math.DG
keywords
boundarynullacrossalmostannoyingassumptionsboundariescase
read the original abstract
We consider a class of globally hyperbolic space-times with "expanding singularities". Under suitable assumptions we show that no $C^0$-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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