Open Problems in Mathematical General Relativity
The Kerr Problem Archive
A living, community-maintained database of open problems concerning the Kerr spacetime — the rotating black hole solution to Einstein's vacuum equations. Every problem is traceable to a primary source. Status updates as the field moves.
Browse all 50 problems →Flagship Problems
The three deepest open questions in the archive.
K-001
Full nonlinear stability of subextremal Kerr
K-101
Strong Cosmic Censorship threshold for Kerr interiors
K-201
Nonlinear codimension-1 stability of extremal Kerr with horizon hair