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Mark Stuckey replied to the topic Relational Blockworld: Providing a Realist Psi-Epistemic Account of QM in the forum Retrocausal theories 8 years, 10 months ago
Thanks for your question, Peter. Causality and change can certainly be represented in 4D spacetime, so I didn’t mean to imply otherwise. The Geroch quote is, as you say, pointing out the fact that the 4D perspective *itself* doesn’t change. We use that “changeless” 4D perspective for two reasons. First, 4D spacetime lacks a Now in the sense t…[Read more]
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Mark Stuckey replied to the topic Holism and time symmetry in the forum Retrocausal theories 8 years, 10 months ago
I imagine local properties existing on p — B and q — A of Figure 3. So, on S — p and S — q you have holism and thereafter you have retrocausality. The two situations (holism and retrocausality) are, as you point out, distinct concerning local properties, but can be mixed (Figure 3) and transformed smoothly and continuously from one to another.…[Read more]
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Mark Stuckey replied to the topic Holism and time symmetry in the forum Retrocausal theories 8 years, 10 months ago
Let me start by saying I believe the main claim of your paper is correct and perfectly in keeping with the conventional understanding of holism. What I’m proposing is a change to the conventional understanding of holism based on the example in your paper. Sorry if you thought I was trying to refute your main claim. Attached is a candidate for t…[Read more]
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Mark Stuckey replied to the topic Holism and time symmetry in the forum Retrocausal theories 8 years, 10 months ago
Thanks for your reply, Peter. Please see attached a clarification of my point.
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Mark Stuckey replied to the topic Relational Blockworld: Providing a Realist Psi-Epistemic Account of QM in the forum Retrocausal theories 8 years, 10 months ago
Hi Bob,
Thanks for your input, it’s much appreciated and not the least bit “offensive.”
We were concerned about just this sort of reaction, that’s why we tried the outline. Since that didn’t work, let me attach the slides for a short talk I had planned to give in Vaxjo last month (I instead gave the quantum Cheshire Cat talk posted in the “Other…[Read more] -
Mark Stuckey replied to the topic Holism and time symmetry in the forum Retrocausal theories 8 years, 10 months ago
Peter,
Your understanding of SEPRB agrees with mine, so I’m hoping you’ve got it right 😉In the context of Evans’ paper in this forum, we might depict the holism of EPRB you describe as an undirected space-like link between its space-like separated outcomes (a la the undirected links in Evans’ Fig 4). One could attribute a direction to that li…[Read more]
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Mark Stuckey replied to the topic Quantum causal models, faithfulness and retrocausality (onl. 7/16 @ 11pm UTC+10) in the forum Retrocausal theories 8 years, 10 months ago
The argument that retrocausality in a block universe violates faithfulness is essentially reflected by an anonymous referee in footnote 3 of our paper http://www.ijqf.org/wps/wp-content/uploads/2015/06/IJQF2015v1n3p2.pdf:
“I do not see how anything truly ‘retrocausal,’ in a dynamical sense, can occur given global time-symmetric constraints on…[Read more]
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jacksarfatti and Mark Stuckey are now friends 8 years, 10 months ago
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Mark Stuckey replied to the topic The Quantum Cheshire Cat Experiment of Denkmayr et al in the forum Pragmatist approaches 8 years, 11 months ago
Raul told me today that he doesn’t see any connection between Aharonov qCC and Denkmayr (alleged) qCC because Denkmayr doesn’t have a displaced pointer state. A weak values theorist (who asked not to be cited) agreed with our analysis saying “weakly enough” in Denkmayr should have read “linearly” because weak measurement requires linear…[Read more]
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Mark Stuckey started the topic Relational Blockworld: Providing a Realist Psi-Epistemic Account of QM in the forum Retrocausal theories 8 years, 11 months ago
We update our Relational Blockworld (RBW) explanation of quantum physics and argue that it provides a realist psi-epistemic account of quantum mechanics as called for by Leifer. The paper is posted at http://www.ijqf.org/wps/wp-content/uploads/2015/03/Stuckey-et-al-2015-Revised-v2.pdf and will appear in the next issue of IJQF. The paper is 41 pp…[Read more]
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Mark Stuckey replied to the topic The Quantum Cheshire Cat Experiment of Denkmayr et al in the forum Pragmatist approaches 8 years, 11 months ago
I’ve had extensive contact with Raul Correa since last fall about his paper and ours. He failed to tell me that he got his paper accepted in New J Phys, but he apologized this week 🙂
Correa et al explain how Aharonov’s proposed quantum Cheshire Cat (qCC) experiment with photons can be understood via interference. When they discuss the Denkmayr…[Read more]
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Mark Stuckey started the topic The Quantum Cheshire Cat Experiment of Denkmayr et al in the forum Pragmatist approaches 8 years, 11 months ago
In a July 2014 Nature Communications paper, Denkmayr et al. made the spectacular claim that in their interferometer experiment “the neutron and its spin are spatially separated.” They support their claim via their so-called “weak values” in this experiment, thus they claim to have successfully carried out the quantum Cheshire Cat experim…[Read more]
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Mark Stuckey replied to the topic What are the most pressing problems? and how to solve them? in the forum Panel Discussion 9 years, 1 month ago
The hidden variables in RBW are the (graphical) spacetimesource element and the adynamical global constraint. We take a God’s eye (4D) view, so our hidden variables don’t “bring about events.” Per Geroch,
“There is no dynamics within space-time itself: nothing ever moves therein; nothing happens; nothing changes. In particular, one does not…[Read more]
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Mark Stuckey replied to the topic What are the most pressing problems? and how to solve them? in the forum Panel Discussion 9 years, 1 month ago
We’d be interested in how you classify RBW per your taxonomy, Dieter. Along those lines, Silberstein and I will try to explain the principle of superposition per RBW, as an example of your 3b (hidden variable, psi-epistemic) classification. [Sorry, we’re not sure how to do this for a general 3b case.]
In our view, the fundamental ont…[Read more]
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Mark Stuckey commented on the post, 2019 International Workshop: Beyond Bell’s theorem 9 years, 1 month ago
PTI certainly qualifies as “outside our comfort zone!” I did not mean to imply otherwise. [RBW is itself a form of direct action, so we took the liberty of referencing your IJQF paper for that in http://www.ijqf.org/archives/2087.%5D Have you yet extrapolated PTI’s implications for physics? I would like to see a PTI approach to quantum gravity, for example.
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Mark Stuckey changed their profile picture 9 years, 1 month ago
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Mark Stuckey replied to the topic What are the most pressing problems? and how to solve them? in the forum Panel Discussion 9 years, 1 month ago
I agree with Zeh, as I posted elsewhere http://www.ijqf.org/archives/2144, that “It is even more unfortunate that this confusion seems to be accompanied by a certain amount of prejudice (for or against some kinds of proposals).” I also agree “that we cannot decide between all these possibilities without any novel empirical evidence.” So, my…[Read more]
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Mark Stuckey commented on the post, Relational Blockworld: Providing a Realist Psi-Epistemic Account of Quantum Mechanics 9 years, 1 month ago
(*This is good stuff. It really helps to position what you’re doing against what others are doing.*)
Thanks for taking the time to read and comment on the paper, as always Peter.
(*I think it’s right to say that the difference between yourselves and Price & Wharton is largely a matter of stress. They stress the backwards causation, you s…[Read more]
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Mark Stuckey commented on the post, 2019 International Workshop: Beyond Bell’s theorem 9 years, 1 month ago
Rovelli is correct that psi-ontology versus psi-epistemology is at the heart of the confusion about quantum theory. Psi-ontology has to deal with the measurement problem and collapse of the wave function, as Rovelli points out, while psi-epistemology leaves us asking, “Knowledge ABOUT WHAT?” Likewise, quantum information theory per Gri…[Read more]
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