<P> The structure of the multiverse, the nature of each universe within it and the relationship between the various constituent universes, depend on the specific multiverse hypothesis considered . Multiverses have been hypothesized in cosmology, physics, astronomy, religion, philosophy, transpersonal psychology and fiction, particularly in science fiction and fantasy . In these contexts, parallel universes are also called "alternative universes", "quantum universes", "interpenetrating dimensions", "parallel dimensions", "parallel worlds", "alternative realities", "alternative timelines", and "dimensional planes", among others . </P> <P> A theory of everything (TOE) is a putative theory of theoretical physics that fully explains and links together all known physical phenomena, and predicts the outcome of any experiment that could be carried out in principle . The theory of everything is also called the final theory . Many candidate theories of everything have been proposed by theoretical physicists during the twentieth century, but none have been confirmed experimentally . The primary problem in producing a TOE is that general relativity and quantum mechanics are hard to unify . This is one of the unsolved problems in physics . </P> <P> Initially, the term "theory of everything" was used with an ironic connotation to refer to various overgeneralized theories . For example, a great - grandfather of Ijon Tichy, a character from a cycle of Stanisław Lem's science fiction stories of the 1960s, was known to work on the "General Theory of Everything". Physicist John Ellis claims to have introduced the term into the technical literature in an article in Nature in 1986 . Over time, the term stuck in popularizations of quantum physics to describe a theory that would unify or explain through a single model the theories of all fundamental interactions and of all particles of nature: general relativity for gravitation, and the standard model of elementary particle physics--which includes quantum mechanics--for electromagnetism, the two nuclear interactions, and the known elementary particles . </P> <P> Current candidates for a theory of everything include string theory, M theory, and loop quantum gravity . </P>

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