> On 18 Sep 2019, at 12:22, Philip Thrift <cloudver...@gmail.com> wrote:
> 
> 
> 
> On Tuesday, September 17, 2019 at 11:46:35 PM UTC-5, Bruce wrote:
> On Wed, Sep 18, 2019 at 10:37 AM 'Brent Meeker' via Everything List 
> <everyth...@googlegroups.com <javascript:>> wrote:
> On 9/17/2019 3:49 PM, Bruce Kellett wrote:
>> On Wed, Sep 18, 2019 at 3:01 AM smitra <smi...@zonnet.nl <javascript:>> 
>> wrote:
>> On 17-09-2019 13:32, Bruce Kellett wrote:
>> > 
>> > So why do all Everettians have to add so many additional assumptions
>> > in order to pretend to get out the Born rule?
>> > 
>> 
>> Simply assuming the special case of the Born rule that measuring a 
>> system in an eigenstate of an observable will yield the eigenvalue of 
>> that eigenstate with  certainty, is enough.
>> 
>> Where did the concept of an observable as an operator in a Hilbert space, 
>> and the idea that measurements correspond to the action of that observable  
>> on the state, giving a result that is the eigenvalue corresponding to the 
>> projected eigenvector, come from?
> 
> The operator should be expressible in terms of the Hamiltonian of the 
> measuring instrument and its interaction with the system.  But nobody tries 
> to write down the Hamiltonian of the instrument; they just look at what it's 
> supposed to measure classically and then they write an abstract operator that 
> does that.
> 
> So it is something added to the supposed "minimal QM" of the Schrodinger 
> equation. The eigenvector/eigenvalue link is pretty well established. Zurek 
> has a good argument to derive this. 
> 
> Bruce
> 
> 
> 
> The Zurek (QD) theory is a very good (in my view) framework to consider. A 
> useful antidote to MWI.
> 
> https://arxiv.org/abs/1807.02092 <https://arxiv.org/abs/1807.02092>
> 
> Quantum Theory of the Classical: Quantum Jumps, Born's Rule, and Objective 
> Classical Reality via Quantum Darwinism
> 
> Wojciech Hubert Zurek
> (Submitted on 5 Jul 2018)
> 
> 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, Born's rule 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.

That is meaningful …. only in the MW.

Bruno



> 
> 
> 
> @philipthrift 
> 
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