Many-Worlds Interpretation of Quantum Mechanics

The Many-Worlds Interpretation of Quantum Mechanics, proposed by Hugh Everett in 1957, claims that every quantum measurement splits the universe into parallel realities, making it the most philosophically audacious theory on this list. This interpretation resolves quantum paradoxes without invoking a collapse of the wave function, but it posits an infinite number of unobservable branches. In a 2023 survey, only 18% of physicists accepted many-worlds, while 58% preferred Copenhagen-style collapse—a clear margin that underscores its controversial status. Compared to string theory (#2), which also struggles with testability, many-worlds faces the unique challenge of ontological inflation: it predicts trillions of copies of each observer, yet offers no way to falsify them. This lack of empirical grounding is why many-worlds often outperforms more traditional views in philosophical discussions but remains a fringe scientific bet, falling 15% below the average acceptance rate for established theories.