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math.DG2013★ 2 cited
Positive isotropic curvature and self-duality in dimension 4
Thomas Richard, Harish Seshadri
We study a positivity condition for the curvature of oriented Riemannian 4-manifolds: The half- condition. It is a slight weakening of the positive isotropic curvature ()…
math.DG2013★ 2 cited
Noncoercive Ricci flow invariant curvature cones
Thomas Richard, Harish Seshadri
This note is a study of nonnegativity conditions on curvature which are preserved by the Ricci flow. We focus on specific kinds of curvature conditions which we call noncoercive, t…