On 2/16/2020 6:09 AM, Bruno Marchal wrote:
On 16 Feb 2020, at 05:50, 'Brent Meeker' via Everything List
<[email protected]
<mailto:[email protected]>> wrote:
On 2/15/2020 9:09 AM, smitra wrote:
That's funny, since 20 lines above you invoked the_ lack_ of
isolation to explain measurements.
Brent
Measurement can be fully described by local interactions, so it's
compatible with the entire system comprising of measured system plus
observer, being completely isolated.
In a completely isolated system it can only be a mixed state FAPP
unless there is non-unitary evolution.
Is not the physical universe (assuming that exists) completely
isolated? If you were right, there would be no quantum mechanics. You
lost me here.
MWI gets around this by saying there are multiple worlds...but only
FAPP. Other interpretations like the transactional interpretations say
there is non-unitary evolution.
Brent
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