In a review of cosmologist Sean Carroll’s new book, Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime, we read:
Six decades on, the [many worlds/ multiverse] theory is one of the most bizarre yet fully logical ideas in human history, growing directly out of the fundamental principles of quantum mechanics without introducing extraneous elements. It has become a staple of popular culture, although the plots of the many films and television series inspired by it invariably flout the theory by relying on contact between the parallel worlds, as in the 2011 movie Another Earth.
In Something Deeply Hidden, Carroll cogently explains the many-worlds theory and its post-Everett evolution, and why our world nevertheless looks the way it does. Largely because of its purely logical character, Carroll calls Everett’s brainchild “the best view of reality we have” …
Nevertheless, non-scientists might have lingering problems with Carroll’s breezy, largely unexamined ideas about “reality”. Like many physicists, he assumes that reality is whatever a scientific theory says it is.
Robert P. Crease, “The bizarre logic of the many-worlds theory” at Nature
Crease writes as if he would very much like to buy in but still thinks that sanity has something to offer. Possibly, many establishment science figures teeter on that brink.
Sabine Hossenfelder offers a different perspective:
Hossenfelder Summarizes Multiverse Theories, Asks: Science Or Fiction?
and
Hossenfelder: The multiverse is a fringe idea
True, it’s a fringe idea. But it’s one very big fringe, trailing out the door and down the street and beyond the furthest galaxy…
Bunk, sure, but lotta bunk.
See also: The multiverse is science’s assisted suicide
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