>is there a theory that encompasses General Relativity and defines a theoretical largest possible distance/time? It's possible to define a universe of nearly a

>is there a theory that encompasses General Relativity and defines a theoretical largest possible distance/time? It's possible to define a universe of nearly any possible shape, but most aren't really compatible with our observations. One that fits reasonably well would be the de Sitter space, which fits most important criteria, and has a finite size at each moment in time.