I found this interesting post on another forum:
I've been interested in multidimensional concepts and the idea of parallel universes for a long time, and I've got my own interpretation of it which I would like to include here, so that those of you who know a lot more about this than I do, can tell me how far off base I am.
At any particular moment in time, if it was possible to reduce time to a smallest unit, every particle in the universe exists in one of many possible states, and in every moment in time every possible state exists as a different dimension, reducing the universe itself into sort of a particle when viewed outside time as every possible state of that universe-particle becomes analagous to the possible states of a particle within the universe. The seperating factor between these states being time, with which the universe-particle becomes more like a field of energy.
A universe within time can be defined as an arbitrary line drawn from one point in this field to another, connecting quantum states and potentialities between them. So thinking in terms of parallel universes (one where Hitler lost the war, one where he won, etc) is incorrect because instead of seperate 'threads' or 'bubbles' you have a cascading (propagating?) field of probabilities in higher dimensions, and the universe only exists as a seperate object from other universes when time is not a factor.
Now bearing in mind everything I know about this kind of thing I've only read in various books, and am a layman when it comes to the math, I wonder if this is a correct interpretation or not, and if not, why not?