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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 ...
A common feature of all four multiverse levels is that the simplest and arguably most elegant theory involves parallel universes by default. To deny the existence of those universes, one needs to complicate the theory by adding experimentally unsupported processes and ad hoc postulates: finite space, wave function collapse and ontological ...
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A series of novels featuring a grown-up version of E. Nesbit's Oswald Bastable (from The Story of the Treasure Seekers and other books) who experiences a variety of alternate realities that have diverged from his own timeline. Warlord of the Air (1971) The Land Leviathan (1974) The Steel Tsar (1977) Operation Otherworld: Poul Anderson
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:
Gribbin also criticized the lack of depth on certain subjects, such as M-theory and the interactions of three-dimensional universes. [3] Publishers Weekly hails The Hidden Reality “An in-depth yet marvelously accessible look inside the perplexing world of modern theoretical physics and cosmology . . . Greene presents a lucid, intriguing, and ...
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Part I (Chapters 1–4) covers the Big Bang, the early development of the Universe, and how these topics relate to the Eternal Inflation Multiverse (Level II in the Tegmark hierarchy of Multiverses). Part II (Chapters 5–9) covers M-Theory and the "Many-Worlds interpretation" of Quantum Mechanics (Level III Multiverse). It also discusses how ...