The multiverse comes down to an argumentagainst fine-tuning of our universe.
The Multiverse is an extremely controversial idea, but at its
coreit’s a very simple concept. Just as the Earth doesn’t occupy a special position in the Universe, nor does the Sun, the Milky Way, or any other location, the Multiverse goes a step farther and claims that there’s nothing special about the entire visible Universe.
The Multiverse is the idea that our Universe, and all that’s contained within it, is just one small part of a larger structure. This larger entity encapsulates our observable Universe as a small part of a larger Universe that extends beyond the limits of our observations. That entire structure — the unobservable Universe — may itself be part of a larger spacetime that includes many other, disconnected Universes, which may or may not be similar to the Universe we inhabit…
If you have an inflationary Universe that’s governed by quantum physics, a Multiverse is unavoidable. As always, we are collecting as much new, compelling evidence as we can on a continuous basis to better understand the entire cosmos. It may turn out that inflation is wrong, that quantum physics is wrong, or that applying these rules the way we do has some fundamental flaw. But so far, everything adds up. Unless we’ve got something wrong, the Multiverse is inevitable, and the Universe we inhabit is just a minuscule part of it. Ethan Siegel, “This Is Why The Multiverse Must Exist” at Forbes
Yes, Siegel has talked himself into a simple concept, all right. Anyone could think it up. His supporting theses? Cosmic inflation seems a troubled theory at best and quantum mechanics offers support for a multiverse only if you interpret it in a specific way (not the usual way).
And if the multiverse “must exist,” then science must die because the multiverse is science’s assisted suicide. It eliminates the concept of evidence. But when we look at the actual patterns of evidence, maybe that’s what this generation of cosmologists needs to do, to save their positions if not their discipline.
You should be suspicious of any science claim that could have been thought up as a sheer work of the imagination. The multiverse is just such a concept: S
But in the world of the war on math, that might not be such a disadvantage. If they can hitch the multiverse to something the raging Woke can get behind, it’s sure to batter down traditional science’s petty demands for evidence.
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See also: Sabine Hossenfelder: Cosmic inflation is overblown. The author of Lost in Math: How Beauty Leads Physics Astray, makes clear that cosmic inflation was intended to deal with evidence for fine-tuning, which she considers a “waste of time.” But, as she shows, the cosmology has gone nowhere.
Hugh Ross: The fine-tuning that enabled our life-friendly moon creates discomfort Was it yesterday that we noted particle physicist Sabine Hossenfelder’s view that fine-tuning is “a waste of time”? Not so fast. If the evidence points to fine-tuning and the only alternative is the crackpot cosmology she deplores, it’s not so much a waste of time as a philosophically unacceptable conclusion. Put another way, it comes down to fine-tuning, nonsense, or nothing.
What becomes of science when the evidence does not matter?
Cosmic inflation theory loses hangups about the scientific method