On 22-02-2020 01:20, 'Brent Meeker' via Everything List wrote:
On 2/21/2020 4:00 PM, smitra wrote:
On 16-02-2020 05:48, 'Brent Meeker' via Everything List wrote:
On 2/15/2020 9:30 AM, smitra wrote:
The main issue is unitary time evolution. This is a rather
unambiguous thing that one can check in experiments. A breakdown of
unitary time evolution has never been observed.
As Brent has pointed out, unitary evolution breaks down every time
we
observe a particular result for a measurement (to say nothing of
black
holes). Your focus on unitary evolution is misplaced -- it is not
universally observed.
This has no bearing on the unitary time evolution of an isolated
system. We can infer from measurements that an isolated system does
evolve in a unitary way. Non-unitary time evolution would violate the
known laws of physics.
Only the "known" law that all time evolution is unitary. In the
Transactional interpretation there are random violations of unitary
evolution, as there are GRW and other real collapse versions of QM.
You, like most MWI proponents, assume your purist version is a "law of
physics" when the whole question is "What are the laws physics."
Brent
When comparing different theories one has to weigh up the experimental
evidence to see what theory fits the evidence the best. Normally we
would consider theories that introduce new, as of yet unobserved physics
when it's not clear that the theory solves a real problem, to be
extremely speculative. This is the case for collapse theories, they
introduce new physics that has never been observed, and it's then a
purported solution for an issue that's entirely philosophical, with no
bearing on ordinary physics.
It's a bit like opposing Einstein's theory of relativity because of a
dislike of having to abandon absolute time, and then having to introduce
the ether which comes with a lot of potentially experimentally
observable baggage that you then need to explain away.
Saibal
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