[GW and Twins Pawpaw]

The idea of a multiverse is not new. Hugh Everett did his dissertation on the many worlds interpretation of quantum mechanics in 1957. As I understood it, his idea was that all possible quantum states are expressed.

[GW and Twins Pawpaw]

I guess if I had read a bit further in the article I would have seen in print what I attempted to point out.:-)

[snarks_when_bored]

Yes, the article mentions Everett's work.

But, as I understand it, there's this difference: Everett's branching quantum universes are completely separate and have no physical contact of any kind; the multiple universes of which inflationary cosmologists speak are separate, but, in principle, they could come into physical contact (for example, one could start to expand directly into an adjacent one, that sort of thing). All of the inflationary bubbles would inhabit the same, physical multiverse, whereas the Everett universes are completely separate, alone, part of no larger entity.

[onedoug]

I once sat in a lecture at Caltech where the question was asked, "How many here believe in the many worlds interpration of quantum mechanics?"

Quite a few hands went up.

"How many don't?"

About the same number, many of which were raised before.

That proves it, I guess.