Multiverse Theory - Many-Worlds Interpretation

The Many-Worlds Interpretation (MWI) is a proposed explanation for the measurement problem in quantum mechanics, first put forward by Hugh Everett in 1957. This interpretation suggests that the wave function does not collapse upon measurement. Instead, the universe is seen as always evolving in a single, continuous quantum state according to the Schrödinger equation. When multiple possible outcomes exist from a quantum event, the entire system, including the observer, is interpreted as branching into states with different outcomes. If a particle's measurement has two possible results, then two different universe states exist, each realizing one of the outcomes. Observers after each branching can only experience the outcome they are in, and thus cannot directly confirm the existence of other branches. A key advantage of the Many-Worlds Interpretation is that it doesn't postulate a special process like wave function collapse. However, debates remain regarding whether the universe physically splits and how probabilities should be interpreted. To date, no direct experimental evidence distinguishing it from other quantum mechanics interpretations has been found, and it is considered one of several interpretations of standard quantum mechanics.