Part of the dislike of the MWI is that its proponents assume a purity
that is not an evident virtue of the intepretation. For example,
interpreting the squared amplitudes as probabilities seems to be
assumed, along with the existence of the preferred basis in which the
amplitudes are defined. Together these are almost the same as CI. If
you ask "probabilities of what?" in MWI the answer can't be probability
of existing because MWI has committed to all solutions, however
improbable, existing. So it becomes probability of finding yourself in
a particular world...which depends on a theory of consciousness and
seems to regress to von Neumann and Wigner.
Zurek's envariance attempts to answer these questions and provide a
justification for preferred bases and what probability refers to. But
notice that to the extent he succeeds he is justifying taking a simple
probabilistic view and saying one of those preferred states happens and
the others don't.
Brent
On 10/14/2019 4:36 AM, John Clark wrote:
Philip Thrift <[email protected] <mailto:[email protected]>>
wrote:
/>Have you suddenly become a fan of hidden variables models? In
that case, I am totally on your side./
If you're a fan of hidden variables then, to be consistent with
experimental results, you must also be a fan of non-locality, or
non-reality, or superdeterminism.
/> QM (or the Schrodinger Equation, SE) is incomplete because it
does not solve the measurement problem, /
Many Worlds solves the measurement problem because, unlike every other
interpretation, it precisely defines what a measurement is, it's just
a change, any sort of change. So what you really have is not a
measurement problem but a many worlds problem, and it's only a problem
for emotional reasons not scientific reasons, some people are just
repelled by the idea that there is more than one version of themselves
around; but the universe is not required to be in harmony with
individual human desires.
/> so there must be a new nonlinear SE, /
And all those proposed wheels within wheels added to the Schrodinger
Equation and the massive load of additional mathematical complexity
that entails does not improve the modified equation's ability to
predict experimental results one iota, it gets rid of many worlds and
does absolutely nothing else. It reminds me of a fundamentalist
preacher's theory that the world was made in 4004 BC and God put
dinosaur bones in the ground at that time that look much older but are
not, and God can do that because God can do anything. Making quantum
calculations is difficult enough as it is, we should be looking for
ways to make it easier not harder.
And by the way, all those modifications of the Schrodinger Equation
involve sticking in random factors, Many Worlds has no need of such
random factors, it's contend with the simpler deterministic
Schrodinger Equation just as it is now.
John K Clark
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