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Usage/Application of Raychaudhuri equation in Riemann geometry or pure maths
In fact the same idea, studying the divergence of a flow of geodesics is so important that it has lots of names. Your issue is that you are searching math literature with physics terminology. … arc length; Section 12.1 gives a second introduction to Jacobi tensors and Section 12.2 discusses Jacobi tensors in the context of spacelike surfaces (a free boundary problem for the associated flow of geodesics …