On 5/12/2022 11:27 AM, smitra wrote:
On 12-05-2022 00:44, Brent Meeker wrote:
On 5/11/2022 1:06 PM, smitra wrote:
That's complete and audacious question begging. What you mean by
"real" is "modeled within the SE". There is NOTHING BUT collapse
experimentally; every result recorded in every notebook and every
tape
is evidence of a collapse.
There is effective collapse in experiments we do, but the
experiments nevertheless demonstrate that the fundamental processes
proceed under unitary time evolution.
Except when you measure them and actually get a result.
No, there exist no experiment results that demonstrate that unitary
time evolution is not exactly valid. What you are referring to is that
in experiments we do the wavefunction of the measured system
(effectively) collapses. But, because we also know from all the
experimental results that the wavefunction evolves in a unitary way,
and experiments are ultimately nothing more that many particle
interactions, that either unitary time evolution cannot be exactly
valid or that the collapse during measurement is an artifact of
decoherence where the observer (and the local environment) gets into
an entangled superposition with the measured system. The former
hypothesis lacks experimental support.
"we also know from all the experimental results that the wavefunction
evolves in a unitary way"...until we get a result and then it doesn't.
So does the latter. It's based purely on the absence of a theory of
collapse, beyond, perhaps, decoherence which provides a (sort of) theory
of pointer basis and approach to collapse.
Brent
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