Amal Kumar Raychaudhuri is an Indian physicist renowned for his contributions to the field of general relativity and cosmology. He is particularly well-known for the Raychaudhuri equation, which relates to the behavior of geodesic congruences in spacetime. This equation plays an important role in understanding the nature of gravitational collapse and the formation of singularities in the context of general relativity.
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A physicist whose work explains how the convergence of neighboring freely falling paths depends on spacetime geometry and on their relative motion. The evolution of the expansion scalar of a geodesic congruence separates the effects of the shear tensor of a timelike congruence, rotation and curvature. The resulting focusing arguments are central to gravitational singularity theorems: they help establish what follows from assumptions about gravity without having to solve the Einstein field equations for an exactly symmetric universe.[ref]
Amal Kumar Raychaudhuri by Jayant Vishnu Narlikar. Research section: cosmological models, evolution equation and later singularity-theorem applications