What does it mean to optimize the world, assuming the Many Worlds theory is true?
Increase the probability-weighted average of your utility function over Everett branches.
How does this differ from increasing the expected value of your utility function under a collapse hypothesis?
I don’t think it either does or should, at least for typical utility functions that don’t explicitly care about what interpretation of QM is correct.
How do you choose the measure over Everett branches in the absence of interactions between branches?
According to the Born rule.
I’m not sure what you mean. Can you rephrase that?
What does it mean to optimize the world, assuming the Many Worlds theory is true?
Increase the probability-weighted average of your utility function over Everett branches.
How does this differ from increasing the expected value of your utility function under a collapse hypothesis?
I don’t think it either does or should, at least for typical utility functions that don’t explicitly care about what interpretation of QM is correct.
How do you choose the measure over Everett branches in the absence of interactions between branches?
According to the Born rule.
I’m not sure what you mean. Can you rephrase that?