Re: Parallel Universes

Posted by Pasti on Feb 19, 2002 at 14:13
(64.10.124.25)

Re: Parallel Universes (Preston)

Preston, as much as string theory goes,these strings, and the corresponding background spacetimes cannot have but either 26 or 11 dimensions for spacetime stability,out of which one is time(of course, if you don't consider embeddings and similar).
As much as the multiverse concept goes, it has nothing to do with dimensionality.It only has to do with the concept of "multiplication of some sort" of the spacetime(whatever its dimensions), whether by topological bifurcation (what Tegmark calls a multiply connected universe)or by duplication of some sort(what Tegmark calls the principle of concordance).
It does not mean that if the spacetime has say 12 dimensions, four of them are a universe, another four of them form an additional universe and so on, as you seem to imply.
As for the concept of a designer universe,this is not too much of an explanation for why the laws of physics and the constants in our universe are what they are.It is eventually wishful thinking (unless some proof comes along). And by no means a designer universe excludes a multiverse, and viceversa.This is an error in logic from your part.Just read the beginning of Tegmark's paper.The multiverse he suggests contains only what you would call designer universes!

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