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A parallel universe, also known as an alternate universe, parallel world, parallel dimension, alternate reality, or alternative dimension, is a hypothetical universe co-existing with one's own, typically distinct in some way. [1] The sum of all potential parallel universes that constitute reality is often called the "multiverse".
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.
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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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
Fiction theory (also referred to as Fictionality theory) is a discipline that applies a form of possible world theory to literature. Drawing on concepts found in related theories and psychological ideas such as Parasocial interaction (PSI) and Fictionalism , theorists of fiction study the relationships between perceived textual worlds and ...
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:
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