= Amal Kumar Raychaudhuri
{c}
= A. K. Raychaudhuri
{c}
{synonym}
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.<Amal Kumar Raychaudhuri by Jayant Vishnu Narlikar>[Research section: cosmological models, evolution equation and later singularity-theorem applications]{ref}
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