That's essentially the problem of the origin of Born rule in MWI, which is an unsolved problem.Sherwood Botsford said:If I understand the many worlds QM interpretation correctly, for every quantum event the universe divides.
However not all quantum events have a 50/50 probability. How does the many worlds interpretation deal with quantum events that have,say a 1/3 2/3 probability split?
The Many Worlds Interpretation (MWI) of quantum mechanics suggests that every time a measurement is made, the universe splits into multiple branches, each representing a different possible outcome. However, this raises the question of how unequal probabilities are accounted for in this interpretation.
While the MWI does not deny the existence of probabilities, it offers a different interpretation of their meaning. In this view, probabilities represent our subjective knowledge and uncertainty about the outcomes of measurements, rather than objective properties of the physical world.
Decoherence is the process by which quantum systems become entangled with their environment, leading to the emergence of classical behavior. This process can explain why certain outcomes are more likely to occur in the MWI, as the environment plays a role in determining the branching of universes.
The measurement problem in quantum mechanics refers to the question of how a system in a superposition of states can collapse into a single state upon observation. In the MWI, there is no collapse, as all possible outcomes exist in different branches of the universe. This interpretation avoids the need for a specific mechanism to explain the collapse of the wavefunction.
One criticism of this reconciliation is that it is difficult to test or prove, as it relies on the existence of multiple parallel universes that cannot be observed directly. Additionally, the MWI has been criticized for being overly complicated and lacking empirical evidence. However, it remains a popular interpretation among some scientists and philosophers.