3 papers
gr-qc2025
The transition to phenomenological behaviour of static solutions of the Einstein-Dirac system for an increasing number of fermions
Håkan Andréasson, Joakim Blomqvist
Static spherically symmetric solutions to the Einstein-Dirac system were constructed numerically for the first time in 1999 by Finster, Smoller and Yau \cite{FSY1} in the case of t…
gr-qc2024
Oppenheimer-Snyder type collapse for a collisionless gas
Håkan Andréasson, Gerhard Rein
In 1939, Oppenheimer and Snyder showed that the continued gravitational collapse of a self-gravitating matter distribution can result in the formation of a black hole, cf.~ \cite{O…
math.AP2024
Existence of a minimizer to the particle number-Casimir functional for the Einstein-Vlasov system
Håkan Andréasson, Markus Kunze
In 2001 Wolansky \cite{Wol} introduced a particle number-Casimir functional for the Einstein-Vlasov system. Two open questions are associated with this functional. First, a meaning…