NO MULTIVERSE, NO PLATONISM (Less Air Travel, Too):
Some people go around, and brandish the “Multiverse”. Of course, the “Multiverse” exists, in one’s brain. The brain, among other things, extends all over imagination. Out there, among the galaxies, in the real world, there is no reason to suppose there is a “Multiverse, whatsoever.
It is basically something to sell books with. Or, just as with evil minded religions, for some physicists to claim they are like gods and can believe in something really absurd, and grotesquely self-contradictory:
There is No Universe, But the Universe:
The Universe is all there is. By definition. By philosophical definition. Just by philosophical definition? Not so. Any logic is associated to a universe. If the “logic” is nature itself (“all of the logic”) the associated universe (in the Logic sense), is, well, the Universe.
If something some would want to call the “Multiverse”, whatever that would be, existed, it would be part of the Universe.