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In the eternal inflation theory, which is a variant of the cosmic inflation theory, the multiverse or space as a whole is stretching and will continue doing so forever, [68] but some regions of space stop stretching and form distinct bubbles (like gas pockets in a loaf of rising bread). Such bubbles are embryonic level I multiverses.
Time travel can result in multiple universes if a time traveller can change the past. In one interpretation, alternative histories as a result of time travel are not parallel universes: while multiple parallel universes can co-exist simultaneously, only one history or alternative history can exist at any one moment, as alternative history usually involves, in essence, overriding the original ...
This argument runs as follows: if there were a near-infinite multiverse, there would be posthuman civilizations running ancestor simulations, which would lead to the untenable and scientifically self-defeating conclusion that humans live in a simulation; therefore, by reductio ad absurdum, existing multiverse theories are likely false.
Multiverse (Michael Moorcock), the multiverse of Michael Moorcock Michael Moorcock's Multiverse, a comic book series by Michael Moorcock; The Multiverse, the central concept of the Dungeons and Dragons Planescape setting; Multiverse series, a series of three novels by David Weber and Linda Evans, and Joelle Presby
Stoeger, Ellis, and Kircher [11]: sec. 7 note that in a true multiverse theory, "the universes are then completely disjoint and nothing that happens in any one of them is causally linked to what happens in any other one. This lack of any causal connection in such multiverses really places them beyond any scientific support".
For example, one [23] can think that modal realism is unnecessary because multiverse theory can do all the modal work (e.g. many "worlds" interpretation of quantum mechanics). [ 23 ] A pervasive theme in Lewis's replies to the critics of modal realism is the use of tu quoque argument: your account would fail in just the same way that you claim ...
The concept of the multiverse — a.k.a. the existence of multiple alternate realities — is at the forefront of the internet's mind, thanks to both the new 'This was my Multiverse of Madness ...
Paul Steinhardt, who produced the first example of eternal inflation, [1] eventually became a strong and vocal opponent of the theory. He argued that the multiverse represented a breakdown of the inflationary theory, because, in a multiverse, any outcome is equally possible, so inflation makes no predictions and, hence, is untestable.