Ricci–Yamabe maps for Riemannian flows and their volume variation and volume entropy

The aim of this short note is to produce new examples of geometrical flows associated to a given Riemannianflow g(t) . The considered flow in covariant symmetric 2-tensor fields will be called Ricci–Yamabe map since it involves ascalar combination of Ricci tensor and scalar curvature of g(t) . Due to the signs of considered scalars the Ricci–Yamabeflow can be also a Riemannian or semi-Riemannian or singular Riemannian flow. We study the associated functionof volume variation as well as the volume entropy. Finally, since the two-dimensional case was the most commonlyaddressed situation we express the Ricci flow equation in all four orthogonal separable coordinate systems of the plane.

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