In mathematics, Ricci-flat manifolds are Riemannian manifolds whose Ricci curvature vanishes. Ricci-flat manifolds are special cases of Einstein manifolds, where the cosmological constant need not vanish.
Since Ricci curvature measures the amount by which the volume of a small geodesic ball deviates from the volume of a ball in Euclidean space, small geodesic balls will have no volume deviation, but their "shape" may vary from the shape of the standard ball in Euclidean space. For example, in a Ricci-flat manifold, a circle in Euclidean space may be deformed into an ellipse with equal area. This is due to Weyl curvature.
- Matthew Randall, Almost Projectively Ricci-flat Manifolds, Dept. of Mathematics, University of Auckland, 2010.
- Dictionary of Distances By Michel-Marie Deza, Elena Deza. Elsevier, Nov 16, 2006. Pg 87
- Arthur E. Fischer and Joseph A. Wolf, The structure of compact Ricci-flat Riemannian manifolds. J. Differential Geom. Volume 10, Number 2 (1975), 277-288.
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