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gr-qc2025
Ultra-massive spacetimes in 2+1 dimensions with positive Λ
Ingemar Bengtsson, José M M Senovilla
We show that ultra-massive spacetimes exist also in 2 + 1 dimensions with a positive cosmological constant Λ > 0. They can be created through the collapse of a spherical null dust…
gr-qc2024
Evolutionary constraints: Gluing in a toy model
Ingemar Bengtsson, Istvan Racz
It is possible to solve the Einstein constraint equations as an evolutionary rather than an elliptic system. Here we consider the Gauss constraint in electrodynamics as a toy model…