The approximation of Einstein's continuum theory of gravitation by a simplicial discretization of the metric space-time manifold and the gravitational action, originally due to Regge (1961). In Regge calculus, the metric tensor associated with each simplex is expressed as a function of the squared edge lengths, which are the dynamical variables of this model Regge geometry can be viewed as a special case of a continuum Riemannian manifold with a flat metric in the interior of its 4-simplices and singular curvature assignments to its two-simplices, known as the bones or hinges (Loll 1998).
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