On 9/26/2019 5:01 PM, Lawrence Crowell wrote:
On Wednesday, September 25, 2019 at 6:54:59 AM UTC-5, John Clark wrote:
It seems that nearly everyone on the list has a strong opinion
about Sean Carroll's new book, but has anyone other than me
actually read it?
John K Clark
I have not read his book, but I have read his papers and the one he
coauthored with Sebbens. I know what he has done. I am definitely
agnostic about MWI as I am with all interpretations. Carroll and
Sebens has though opened the door to a relationship between the Born
rule and MWI,
Didn't you read /Quantum Theory of the Classical: Quantum Jumps, Born’s
Rule, and Objective Classical Reality via Quantum Darwinism /by Zurek.
arXiv:1807.02092v1 [quant-ph] 5 Jul 2018
He derives the Born rule from what he calls "environment induced
supersymmetry".
/Emergence of the classical world from the quantum substrate of our
Universe is a long-standing//
//conundrum. I describe three insights into the transition from quantum
to classical that are based//
//on the recognition of the role of the environment. I begin with
derivation of preferred sets of states//
//that help define what exists - our everyday classical reality. They
emerge as a result of breaking of//
//the unitary symmetry of the Hilbert space which happens when the
unitarity of quantum evolutions//
//encounters nonlinearities inherent in the process of amplification –
of replicating information. This//
//derivation is accomplished without the usual tools of decoherence, and
accounts for the appearance//
//of quantum jumps and emergence of preferred pointer states consistent
with those obtained via//
//environment-induced superselection, or einselection. Pointer states
obtained this way determine//
//what can happen – define events – without appealing to Born’s rule for
probabilities. Therefore, p k =//
//|ψ k | 2 can be now deduced from the entanglement-assisted invariance,
or envariance – a symmetry of//
//entangled quantum states. With probabilities at hand one also gains
new insights into foundations//
//of quantum statistical physics. Moreover, one can now analyze
information flows responsible for//
//decoherence. These information flows explain how perception of
objective classical reality arises from//
//the quantum substrate: Effective amplification they represent accounts
for the objective existence//
//of the einselected states of macroscopic quantum systems through the
redundancy of pointer state//
//records in their environment – through quantum Darwinism./
Brent
and I suspect quantum interpretations in general. Now that is
something I find potentially very interesting.
LC
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