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Can someone in the physics community give us the consensus summary of whether this is serious/real/non-BS? Seems like this would be an absolutely earth-shattering theory result (especially since they claim it's verifiable with a feasible experiment), which seems hard to judge from outside based on the paper itself. Are people buying this, or are there questions?

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It's not earth-shattering for theory, I can tell you that for sure. If you read the citations of the paper, you'll find that Das, Nöth and Dürr already proposed something similar in 2019 which was published in Phys. Rev. A, one of the most respected journals. What these authors are doing is basically to propose a refined (and possibly more general) experimental setup. Whether this actually works out in practice, or even represents a particularly good way to go about it, is beyond my fluency in this field; I would guess the practical effect is incremental at best.

It's earth-shattering, because the current prevailing opinion in physics is that some of those QM interpretations are indistinguishable in reality and that their difference is only a matter of philosophy.

I think what's being asked is if this is the best way to formulate a testable hypothesis.

It seems to pass a first scan here.

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