In some models, alternate realities bubble out from cosmic inflation or form across vast string theory landscapes. Many-worlds, by contrast, keeps its universe clones close—unseen, yet superimposed.

Conventional string theory’s predictions are incompatible both with the observation of dark energy, which appears to be causing our universe’s expansion to speed up, and with viable theories ...

String theory's equations give rise to a near infinite variety of potential universes in a 'landscape.' This landscape is surrounded by a 'swampland' of solutions that are incompatible with any ...

Parallel universes crop up in two places in physical theories. One is in our conception of inflation, the theory of the extremely early universe.In those tumultuous times, many universes may have ...

Each of these solutions corresponds to a universe with its own particles and forces, creating what is called the 'landscape' of string theory. In 2005, it was discovered that this landscape is ...

Studies of the cosmic microwave background, the afterglow of the Big Bang, have revealed that our universe is experiencing accelerated expansion.For this observation to fit with the main theory of ...