Multiverse

The multiverse (or metaverse) is known as a set of possible universes, including the universe in which we live. Together, these universes comprise everything that exists: the entirety of space, time, matter, energy, and the physical laws and constants that describe them.

The various universes within the multiverse are called paraverses, "parallel universes", "other universes", or "alternative universes". The multiverse is contained by the megaverse and it contains the Universe

Part of 6d physics
The multiverse is an energy based expression of the universe with time fragmenting along all plausible causality, making it no longer Fate but Choice. Mass including 4d only travels one path so the other eventualities collapse under weight from time.

Wave particle duality
The Double-slit experiments showed that under a quantum observation matter acted like a particle but like a wave when unobserved, this is due to the interaction that brings both the 4d & 6d together. Instead of acting in 6d space like it should the observer forces the 4d reaction forcing mass down one path