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Do physicists take the multiverse idea seriously? Specifically, the one in the article that says that there are multiple universes each with different physical laws? (This is very different from QM many worlds, where universes share the same laws.)

Most physicists don't think about other universes with other physical laws because they don't really affect what we see.

Cosmologists interested in fine-tuning might.

Quantum foundation theorists often consider alternatives, not because they think they are real, but because it's useful to understand why QM has the form it does. Mostly their results suggest QM is difficult to modify without becoming trivial or useless.

I think the drive comes more from the metaphysical direction. It's hard to imagine why one set of laws would emerge as physical unless all sets of laws are physical, just by virtue of existing mathematically.

Certainly some do. Max Tegmark would be an example[1]. He posts a sort of "all possible universes with all possible laws". (I think "possible" in this context roughly means mathematically consistent.)

[1] https://www.amazon.com/Our-Mathematical-Universe-Ultimate-Re...

Theoretical physicists explore lots of crazy ideas and their implications. It's necessary to keep an open mind when you're working on the outer edges of science.

Max Tegmark is famous for his occasional crackpot theories. If anything they make for good sci-fi.

The reality of Multiverse is undetermined and it is untestable. Unless someone discuss methods to test it, it's a waste of time because there is nothing to learn on our universe with it.

It would be a mistake to call back into question the existence of multiverse. And a mistake as big to claim it exist.

Until a method to test it is found, discussing this idea is a waste of time. However I would respect people searching and discussing methods to test it if they have pertinent things to say.

"seriously" there's no obvious reason they couldn't exist but at the same time most of us, some what tautologically from the definition of universe, believe that their existence is completely untestable and so: a fun conversation for drunk physicists but not something to look for grant money for.

I love the idea that there is no [quantum] probability, every universe that may exist according to quantum formulae, exists in some manner.

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