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gr-qc2026
Coherent Selection of Critical Kasner Response
Yi-kun Li
A coherent wave component with extremely small initial self-energy can substantially change the first response of a contracting spacetime. We demonstrate this effect in Einstein--M…
gr-qc2026
Optimal Extension Regularity at the McVittie Event Horizon
Yi-kun Li
We determine the optimal local extension regularity of the future black-hole event horizon in the exact spatially flat McVittie solutions sourced by a positive cosmological constan…
gr-qc2026
Hair or a Boundary Source? Covariant Phase Space of a Static Type-I Black Hole
Yi-kun Li
We study the two-parameter static type-I vacuum black hole recently obtained from an electromagnetic seed by a nonlinear solution-generating map. Its parameter changes dimensio…