Well, in my local bookstore every book I looked into that had something to say about this matter seemed to mention them.
But we will have to classify alternate universes into two categories here:
1.Universes that exist because of decisions in our universe (or, generally in our complex of universes): It seems to be the case that for every decision of a quant to stay in one place immediately a parallel universe comes into existance where the quant decided to be in the other place. This leads to a certain amount of universes, where there is no life, no human life, where there is human life, universes in which I exist, but have a different name or might have had a car accident and so on... billions of them. And every millisecond there are more. But they all started as one, so that makes them a cluster of parallel universes.
2.Universes that are in no way linked to ours.The current theory is that we live on a thing called a brane,which either exists as a single phenomenon (even though this is not very likely)or in an environment with lots of other branes which lie near our brane. The gravitational forces of these branes influence one another (this could also be the explanation for the existance of dark matter - we simply can`t see the matter as it lies in another brane.) these branes can be thought of as waterbubbles in a pot with boiling water. They come into existence, and then either collapse again immediately or reach a certain critical size so that they continue growing.
The problem with these branes growing close to each other and possibly even moving is, that eventually two branes could crash. No one knows for sure what would happen then, but it probably isnt very pleasant. One theory now states that the big bang could possibly have been caused by such a collision.
Hm, I actually am an evolutionist... but I still won't run ...
This message has been edited by AdminNosy, 02-25-2006 01:04 AM