Multiverse

The multiverse is the hypothetical set of all universes. Together, these universes are presumed to comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them. The different universes within the multiverse are called "parallel universes", "flat universes", "other universes", "alternate universes", "multiple universes", "plane universes", "parent and child universes", "many universes", or "many worlds". One common assumption is that the multiverse is a "patchwork quilt of separate universes all bound by the sa

interpretation of quantum mechanics which denies the collapse of the wavefunction

theory stating that external physical reality is a mathematical structure

cosmological model in which the inflationary phase lasts forever throughout most of the multiverse but we find ourselves in a small corner in which inflation has stopped

thought experiment in which one plays Russian roulette with the trigger connected to the Geiger counter measuring the decay of a radioactive atom

idea that says unidentified flying objects (UFOs) and related events involve visitations from other "realities" or "dimensions" that coexist separately alongside our own

space of vacua of string theory, or equivalently quantum field theories obtainable as low-energy limits of string theory

5th episode of the fourth season of Star Trek: The Next Generation