Re: reasoning under computational limitations
Wed, 7 Apr 1999 23:04:48 -0700

Wei Dai, <>, writes:
> I don't understand this either. How can there be a infinity of points at
> one Planck time after the Big Bang at the center of mass of the universe?

I don't think the universe has a center of mass in most models. The homogeneity of the universe is a fundamental assumption. A homogeneous universe may be spatially closed, like the surface of a hypersphere, and have a finite size. Or it may be spatially open, like a plane, and have an infinite size. But in neither case is there a center of mass.