How can Many Worlds be reconciled with unequal probabilities

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SUMMARY

The Many Worlds Interpretation (MWI) of quantum mechanics posits that the universe splits for every quantum event, but it faces challenges when addressing quantum events with unequal probabilities, such as a 1/3 to 2/3 split. The discussion highlights that the probability associated with each branch indicates the likelihood of an observer finding themselves in a particular outcome, leading to confusion about the existence of alternate branches. This issue relates directly to the unresolved problem of deriving the Born rule within the MWI framework.

PREREQUISITES
  • Understanding of Quantum Mechanics principles
  • Familiarity with the Many Worlds Interpretation (MWI)
  • Knowledge of the Born rule in quantum theory
  • Basic grasp of probability theory in quantum contexts
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  • Research the derivation of the Born rule in Many Worlds Interpretation
  • Explore the implications of unequal probabilities in quantum mechanics
  • Study the philosophical implications of observer states in MWI
  • Examine alternative interpretations of quantum mechanics for comparison
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Quantum physicists, philosophers of science, and students of quantum mechanics seeking to understand the complexities of the Many Worlds Interpretation and its implications for probability theory.

Sherwood Botsford
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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?
 
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I have been told that it is the probability that you end up in a certain branch. But that would suggest 'you' don't end up in a different branch. I find it puzzling.
 
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?
That's essentially the problem of the origin of Born rule in MWI, which is an unsolved problem.
 

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