Comment Re:Words, words (Score 1) 458
I think that this is a great article, but...
It is obvious that there are parts of the universe that are not (and never have been) causally connected with our universe.Those are just the parts of our universe we can't see, which are inevitable in an infinite universe with a finite duration and a finite speed of light. You don't need either quantum mechanics or inflation for that, and it has never been called the "multiverse."
So let me try to explain it this way.
We have an observable universe.
If you were at the far end of our observable universe, and asked "what is the observable universe from here?", you'd get a different observable universe.
Repeat this process. You have many different observable universe patches that overlap.
Join them as a union. You have a "master observable universe".
No matter how much you try, you cannot cover *EVERYTHING*.
If the old view -- inflation happened, and then stopped -- were true, you would have everything. Might take you a very long time (even Einstein wasn't sure the universe was finite), but you would.
This is saying that some areas are just outside of any such overlapping collections of observable universes.