The Riemann curvature tensor Rμνρσ has the geometric interpretation of giving how much parallel transport fails to close around tiny loops. The Ricci tensor Rμν the Riemann curvature averaged over all directions, as in, if there is negative curvature in some direction there must be positive curvature in another if Rμν=0.
What is the geometric interpretation of the Einstein tensor Gμν=Rμν−12gμνR? Is there a way to understand ∇μGμν=0 Intuitively?
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