Many-Worlds Interpretation
The Many-Worlds Interpretation (MWI) is an interpretation of quantum mechanics that was first proposed by Hugh Everett in the 1950s. It suggests that the wave function, which describes the state of a quantum system, evolves deterministically and continuously according to the Schrödinger equation. However, instead of collapsing into a single outcome upon measurement, the wave function splits into multiple branches or "worlds," each corresponding to a different possible outcome.
According to the MWI, every possible outcome of a measurement actually occurs, but they exist in separate branches of reality, which are referred to as "parallel universes" or "parallel worlds." Each branch represents a different state of the universe resulting from different measurement outcomes. These branches do not interact or influence each other, and observers in each branch perceive only a single outcome consistent with their measurement.
In this interpretation, the universe as a whole is viewed as a vast superposition of all possible states, constantly branching into multiple parallel worlds at every quantum interaction. The wave function is seen as a complete and objective description of reality, encompassing all possible outcomes.
The Many-Worlds Interpretation provides a solution to the measurement problem in quantum mechanics, as there is no need for wave function collapse or the postulation of separate measurement processes. Instead, the wave function evolution is seen as continuous and deterministic.
Critics of the Many-Worlds Interpretation argue that it introduces a vast number of unobservable and untestable parallel worlds, which raises questions about the empirical status of the interpretation. Furthermore, the issue of how the branching of worlds occurs and how observers are connected to a particular branch remains a topic of debate and philosophical inquiry.
It is important to note that the Many-Worlds Interpretation is just one of many interpretations of quantum mechanics. Different interpretations offer different perspectives on the fundamental nature of quantum phenomena, and the choice of interpretation often depends on personal preference and the interpretive challenges one finds most compelling.
