Generalized Calabi–Markus conjecture for positive sectional curvature

Let pq>0p\ge q>0 with p+q3p+q\ge3. Suppose that MM is a complete pseudo-Riemannian manifold of signature (p,q)(p,q) whose sectional curvature has a positive lower bound.

Generalized Calabi–Markus conjecture. The fundamental group π1(M)\pi_1(M) is finite, and MM is noncompact.

This conjecture generalizes the Calabi–Markus theorem from Lorentz geometry to pseudo-Riemannian manifolds of arbitrary signature satisfying the stated inequalities. The source gives no resolution status.

Sources & referencesView supporting material

Primary source

Toshiyuki Kobayashi, “On discontinuous group actions on non-Riemannian homogeneous spaces”, arXiv:math/0603319 (2006).

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