Raychuraduri equation

Raychuraduri equation

[‚rā·chu̇r¦ə¦du̇r·ē i‚kwā·zhən]
(relativity)
An equation of general relativity theory, useful in proving singularity theorems, that relates the expansion, convergence, and shear of a congruence of time-like or null curves to the amount of matter present.