Science, physics and philosophy

• Multiverse
  Multiverse
  The multiverse is the hypothetical set of multiple possible universes that together comprise all of reality.Multiverse may also refer to:-In fiction:* Multiverse , the fictional multiverse used by DC Comics...
  
  , the hypothetical set of multiple possible universes
• The many-worlds interpretation
  Many-worlds interpretation
  The many-worlds interpretation is an interpretation of quantum mechanics that asserts the objective reality of the universal wavefunction, but denies the actuality of wavefunction collapse. Many-worlds implies that all possible alternative histories and futures are real, each representing an...
  
   of quantum physics

Fiction

• Parallel universe (fiction)
  Parallel universe (fiction)
  A parallel universe or alternative reality is a hypothetical self-contained separate reality coexisting with one's own. A specific group of parallel universes is called a "multiverse", although this term can also be used to describe the possible parallel universes that constitute reality...
  
  , alternative universes, worlds, realities and dimensions in fiction
• Alternative universe (fan fiction)
  Alternative universe (fan fiction)
  An alternative universe , commonly abbreviated as AU, is a type or form of in which canonical facts of setting or characterization in the universe being explored or written about are deliberately changed.Stories that fall into this definition are usually what-ifs, where possibilities arising from...
  
  , fiction by fan authors that deliberately alters facts of the canonical universe written about
• List of fiction employing parallel universes

Music

• Parallel Universe (4hero album)
• Parallel Universe (Leiahdorus album)
• Parallel Universe (Garnet Crow album)
• "Parallel Universe" (song)
  Parallel Universe (song)
  "Parallel Universe" is a promotional single by the Red Hot Chili Peppers from their 1999 album, Californication. Although it never was released as a tangible CD single, it charted on the US Modern Rock Tracks at number 37 during the week of March 24, 2001, and appeared on Greatest Hits.It is the...
  
  , a 2000 song by the Red Hot Chili Peppers
• Kalakala: Songs from a Parallel Universe (featuring a song cycle for solo cello by Serena Tideman)

Literature, film, & television

• "Parallel Universe" (Red Dwarf), a 1988 episode of Red Dwarf
• Parallel Universes (documentary)
  Parallel Universes (documentary)
  Parallel Universes is a 2001 documentary produced by the BBC's Horizon series. The documentary has to do with parallel universes, string theory, M theory, supergravity, and other theoretical physics concepts...
  
  , a 2001 BBC/Horizon documentary film
• Mirror Universe (Star Trek)
  Mirror Universe (Star Trek)
  The Mirror Universe is a fictional parallel universe in which the plots of several Star Trek television episodes take place...
  
  , a fictional parallel universe in which several Star Trek television episodes take place

See also

• Alternate reality (disambiguation)
• Metaverse
  Metaverse
  The Metaverse is our collective online shared space, created by the convergence of virtually enhanced physical reality and physically persistent virtual space, including the sum of all virtual worlds, augmented reality, and the internet...
  
  
• Multiverse (disambiguation)