What would a multiverse really be like?

A philosopher follows a chain of reasoning, for example:

The possibility of a Spatial or Quantum Multiverse may give you strong reason to doubt your memory and your scientific view of the world. If there are many copies of you being created all the time in all sorts of environments, then only a few of those copies have accurate memories of the world’s history and beliefs about its large-scale structure. The reason is that the majority of them will be created with false memories, even though (since they’re copies of you) they have the same memories you do. They have memories of having lived for years or decades already, but in reality, they popped into existence a few moments ago in a small “bubble” of stability in a chaotic whole. And “they” might be “us.” So a multiverse might force us to question our memories and scientific beliefs.Thomas Metcalf, “A Multiverse of Possibilities” at Arc

The multiverse is not a logical deduction from the state of our universe. It is an attempt to short circuit discussion of apparent fine-tuning by appealing to the idea that no conclusions can be drawn because there is an infinite series we do not know about.

See also: The multiverse is science’s assisted suicide

and

What becomes of science when the evidence does not matter?

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