4-D Universe from Quantum Foam Constraints.

[swestrup]

I'm not sure how to summarize this, nor even if its as (ultimately) an interesting result as it appears at first glance. To put it simply, most models of quantum foam predict either a 2-D or an infintely-dimensioned universe. Now though, some folks have gotten 3D space + Time by imposing some constraints on the quantums of foam. Namely, that C is still a speed limit at that scale, and that causality is never violated. Why these constraints seem necessary is an interesting question.