The Four Levels of the Multiverse by Max Tegmark
Max Tegmark’s work on the multiverse explores four distinct levels of parallel universes: Level I (Beyond our Cosmic Universe), Level II (Other Post-Inflation Bubbles), Level III (Quantum Many Worlds), and Level IV (Other Mathematical Structures). Each level presents unique theories about existence, ranging from variations in cosmological properties to entirely different laws of physics. The common feature among all four levels is the assumption of parallel universes as a natural consequence of the simplest, most elegant theories.
References
Tegmark, M, 2003. Parallel Universes. Journal of Scientific American.
Reference
StudyCorgi. (2025, January 6). The Four Levels of the Multiverse by Max Tegmark. https://studycorgi.video/the-four-levels-of-the-multiverse-by-max-tegmark/