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Raphael Sorkin Syracuse Starting from certain causality conditions and a discrete form of general covariance, we derive a very general family of classically stochastic, sequential growth dynamics for causal sets. The resulting theories provide a relatively accessible ``half way house'' to full quantum gravity that possibly contains the latter's classical limit (general relativity). In connection with a certain renormalization of coupling constants induced by cycles of cosmic expansion and contraction, they also illustrate how the observed cosmological isotropy can be prepared during a tree-like, pregeometric phase of causal set growth.
Tuesday, April 3rd 2001, 13:15 |