On 11/19/2019 1:54 PM, John Clark wrote:
/>The Born rule is a way of predicting probabilities. But how do
these probabilities apply in MWI. Do they apply to
"observations"...but there are no observations in MWI;/
You can have observations in MWI if you want, it's just that
observations don't change physical law so one set of laws is enough.
Sean Carroll and others have shown that the square of the absolute
value of the wave function is the only way for a rational being to
assign unitary probability in a Many Worlds multiverse during the
instant after a split has occurred, and if probability isn't unitary
it's not of much use:
Many Worlds and the Born Rule <https://arxiv.org/pdf/1405.7907.pdf>
The problem is not how to calculate probabilities, it's what do the
probabilities refer to. Observations? Measurements? Personal
experience? Which eigenstate the wave function collapses to? ...all
things that MWI seeks to banish.
Brent
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