In this chapter, Einstein’s gravity with the identification of the curvature of a Riemannian manifold as a geometrical concept and interaction as a physical one is shortly exemplified by Schwarzschild–Kruskal spacetime and by some properties of Friedmann spacetimes with Robertson–Walker metrics. As a warm-up, the group-oriented operational language will be used in those important and basic examples for classical macroscopic gravity.
KeywordsLorentz Group Minkowski Spacetime Global Symmetry Group Friedmann Universe Metrical Tensor
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