On the Existence of Certain Metrics with Non Parallel Ricci Tensor
A. Raouf Chouikha
Abstract
A. Derdzinki [D] gave examples of Riemannian metrics with harmonic curvature and non parallel Ricci tensor on some compact manifolds (M,g] . We examine their existence as well as their number wich naturally depends on the geometry of the manifolds.
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