2 problems

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The model-family conjecture for KS semi-Riemannian manifolds
Model-family conjecture. All $\mathcal{KS}_n$ semi-Riemannian manifolds are contained in the family of Theorem $$ . In particular, in the Lorentzian case, they coincide with their…
Conjectureopencurvature penrose-limits semi-riemannian-geometryarXiv posted 2 days ago
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The constant-curvature conjecture for spacetimes with flat Penrose limits
Constant-curvature conjecture. If all Penrose limits of $(M,g)$ are flat, then $(M,g)$ has constant curvature.
Conjectureopencurvature penrose-limits semi-riemannian-geometryarXiv posted 2 days ago

The model-family conjecture for KS semi-Riemannian manifolds