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gr-qc2023
Coordinates are messy -- not only in General Relativity
Carla Cederbaum, Melanie Graf
The coordinate freedom of General Relativity makes it challenging to find mathematically rigorous and physically sound definitions for physical quantities such as the center of mas…
gr-qc2023
Uniqueness of maximal spacetime boundaries
Melanie Graf, Marco van den Beld-Serrano
Given an extendible spacetime one may ask how much, if any, uniqueness can in general be expected of the extension. Locally, this question was considered and comprehensively answer…