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Many Worlds Interpretation

Proposed by Hugh Everett III in 1957, the Many Worlds interpretation of quantum mechanics hypothesizes that whenever a superposition of probable states exists in the mathematics describing a quantum system, each probable state represents an alternative reality in which that state physically does exist in observable classical reality. Recently the 'worlds' in Everett's interpretation have been taken to designate entire universes, such as those postulated by physicist Max Tegmark in his "Multiverse" theory.

While this interpretation attempts to resolve the Measurement Problem in quantum mechanics, it is generally accepted that while we can observe and measure the final system state that occurs in our own classical reality, it is not possible even in theory to observe counterfactual states in realities we do not inhabit (observe or measure).

While the Copenhagen Interpretation gives the observer special status to determine the final state of the system by virtue of his observation/measurement, Many Worlds extends the entire observer-observed system beyond the single classical reality of our experience. Many physicists accept that the relative factual value of either of these interpretations (and their several more modern formulations) cannot be determined objectively, thus they are considered philosophical extrapolations rather than scientific hypothesis or theory.

Web Resources On Many Worlds Interpretation

The Everett Interpretation
Wikipedia: Many-Worlds interpretation
"Many-Worlds" interpretation of quantum mechanics

Book Resources On Many Worlds Interpretation

The many-worlds interpretation of quantum mechanics by Bryce DeWitt
In Search of Schrodinger's Cat by John Gribbin

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