Manifold-verse

Manifold-verse (重々宇宙, Jūjū-Uchū) often translated as the, Multiverse (多宇宙, Tauchū'') is a proposed hypothesis that has been currently proved to be true.

Overview
The multiverse to begin with, is a collection or possibly a hierarchy of miniature quantum realities, alternate universes, micro-dimensions, etc. The multiverse contains universes or rather infinite number of worlds existing in the same physical plane but these worlds are separated by their vibrational resonances, that is, they have their own frequencies which separate them from each other. Some can seem to be taking place in the past or future due to differences in how time passes in each universe. Often, new universes are born due to time traveling, another name for these new universes is an "alternate timeline".