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There are models of two related universes that e.g. attempt to explain the baryon asymmetry – why there was more matter than antimatter at the beginning – with a mirror anti-universe. [78] [79] [80] One two-universe cosmological model could explain the Hubble constant (H 0) tension via interactions between the two worlds. The "mirror world ...
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 ...
Parallel universes in fiction, a hypothetical self-contained plane of existence, co-existing with one's own; Alternate history, a genre of fiction in which historical events differ from reality; Alternative universe (fan fiction), fiction by fan authors that departs from the fictional universe of the source work
The quantum-mechanical "Schrödinger's cat" paradox according to the many-worlds interpretation.In this interpretation, every quantum event is a branch point; the cat is both alive and dead, even before the box is opened, but the "alive" and "dead" cats are in different branches of the multiverse, both of which are equally real, but which do not interact with each other.
Alternate reality (or Alternative reality, UK English) often refers to parallel universes in fiction, a self-contained separate world, universe or reality coexisting with the real world, which is used as a recurring plot point or setting used in fantasy and science fiction. Alternate reality may also refer to:
If the object of study is formed by the real numbers, then the real line R, which is the real number set, could be the universe under consideration. Implicitly, this is the universe that Georg Cantor was using when he first developed modern naive set theory and cardinality in the 1870s and 1880s in applications to real analysis.
Stephen Hawking popularized the concept of imaginary time in his book The Universe in a Nutshell. "One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which ...
The Antimatter Universe: Post-Zero Hour: The Anti-Monitor, the Crime Syndicate of Amerika, [45] the Sinestro Corps, the Warlock of Ys, and the Weaponers of Qward: The Antimatter Universe is a "universe of evil". It survived the events of Crisis on Infinite Earths and Infinite Crisis and exists alongside the 52 positive-matter alternate universes.