pocket universe

English

Noun

pocket universe (plural pocket universes)

1. A hypothetical realm in inflationary theory, only one of which would contain our observable universe.

   Synonym: bubble universe

2. (gaming) A small, self-contained fictional universe that borrows concepts from established universes.
   • 2013, Frank Garcia, Mark Phillips, Science Fiction Television Series, 1990-2004, page 118:

     I set it in a 'pocket universe' based on role-playing games.

   • 2014, Evan Torner, William J. White, Immersive Gameplay, page 79:

     […] the simulationist sought a game system that created "a little pocket universe without fudging."