Do you believe in the Multiverse Theory?

yes one below the firmament and one above it. the one above the firmament of our universe also encompasses it round about.

a reply to: Unresponsible

"The paradox that made me stop dwelling on the subject was "if there are infinite universes, then there must be infinite in which multiverse theory is not a reality."

That's kinda the good part about it. Many Worlds Interpretation is criticized because it doesn't come "batteries included" with the Born Rule of QM... But because the Born rule is probabilistic, there must necessarily be world lines where the born rule doesn't apply, where its not a law of physics at all, these are the universes where the improbable constantly happens. And of course, as you say, there must be some universes where the idea was never discovered, some where life never arose.

But none of that invalidates it. These are places where a true reality always finds some improbable way to not be validated. We could be living in one of the worlds where the slappingly obvious law of physics everyone else knows is never observed.

The key thing is its just an interpretation, a way to think about an underlying formalism. That formalism is the truth, its a jewel you can turn in different angles to see its different facets, and this is one of them. Its a beautiful way to consider this world we live in, if we open to it!

There are a few different kinds of possible 'multiverse'.

The simplest is just a universe so big that parts of it could never exchange information. Effectively, areas of the universe remote from one another cannot know of each others' existence.

Then there is the possibility of several universes that exist in a higher-dimensional reality, as string theory suggests.

There may be other universes inside black holes.

...and so on. They're all 'possible', more or less, but they're also profoundly irrelevant to us, at least at our current level of understanding. They may as well not exist, so it makes sense to behave as if they don't.

Of course, this could change at any moment.

a reply to: tridentblue

One 'multiverse' (indeed the one discussed by the OP) does arise from quantum theory: the so-called Many Worlds Interpretation of quantum mechanics.

a reply to: Astyanax

The simplest is just a universe so big that parts of it could never exchange information. Effectively, areas of the universe remote from one another cannot know of each others' existence.

(You might not wish to read this Astyanax, as it will probably annoy the hell out of you..Here comes the drivel...you have been warned!)

Theoretically at least, this might not be so.

According to current thinking (not necessarily mine) It may be entirely possible for information to be exchanged between the remotest parts of a Universe, or even between Universes.

If the theory that reality is somehow 'produced upon request', as is being postulated in circles by some theoretical physicists, then it seems plausible to assume that Quantum exchanges of information are absolutely required to facilitate such 'instant reality' across such distances...or else we observers would never even be aware of the distances themselves, as the information would not be exchanged immediately (upon observation) in order to even gauge the distances you speak of...that is of course assuming that reality is created only upon observation.

Do I believe in MVT? In a word, no.

If the universe is infinite, why are more of them necessary? It would require an infinite number of universes, each infinite on its own. That's a whole lot of infinite...

a reply to: MysterX

According to current thinking (not necessarily mine) It may be entirely possible for information to be exchanged between the remotest parts of a Universe, or even between Universes.

Interesting. You have any further information on this (which isn't drivel)?

a reply to: swanne

In chess there are only 20 possible first moves that I can think of.
Once you have made that first move it reduces the number of possible games that can be played enormously.

So if you are saying that you can take back your moves after seeing your opponents response that would give you an unfair advantage.
God doesn't allow cheating at chess.