The set of algebraic curvature operators with sectional curvature at least k is a spectrahedron only up to dimension 3, a spectrahedral shadow in dimension 4, and not a spectrahedral shadow from dimension 5 onward, with algorithms for membership testing.
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Convex Algebraic Geometry of Curvature Operators
The set of algebraic curvature operators with sectional curvature at least k is a spectrahedron only up to dimension 3, a spectrahedral shadow in dimension 4, and not a spectrahedral shadow from dimension 5 onward, with algorithms for membership testing.