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gr-qc2026
Scalar charge bounds for extremal black hole formation
Berend Schneider
I prove that a collapsing charged scalar field with scalar charge that forms an exactly extremal Reissner--Nordström black hole à la Kehle--Unger with radius m…
gr-qc2026
Self-gravitating thin shells are dynamically unstable on all angular scales
Tristan Pitre, Berend Schneider, Eric Poisson
We establish the dynamical instability of a static, spherically symmetric, and infinitesimally thin shell in general relativity. The shell is made up of a perfect fluid with a baro…