@jacksarfatti
active 4 years, 5 months ago
Mark Stuckey replied to the topic Quantum Oblivion and Hesitation in the forum Retrocausal theories 6 years, 10 months ago
Thanks for sending the slides, Avshalom. It was difficult to see exactly what they mean in the absence of your corresponding presentation, so my questions and comments may miss the point. I appreciate your willingness to engage on this issue.
The slides you point to (910) indicate a “revision of history,” akin to Cramer’s TI “pseu…[Read more]

Mark Stuckey replied to the topic General "Block Universe" Discussion in the forum Retrocausal theories 6 years, 10 months ago
I see physics as trying to construct a single model (called reality) to account coherently for disparate subjective experiences; not all experiences of course, just those that are (assumed) common, (approximately) repeatable and can be represented by laws (rules of regularity). What does special relativity (SR) have to tell us about this…[Read more]

Mark Stuckey replied to the topic The toolatechoice experiment: Bell’s proof applied to a timereversed setting in the forum Retrocausal theories 6 years, 10 months ago
I hadn’t seen Cramer’s latest paper, thanks for sending it. If that paper reflects your current view on time and the Block Universe, maybe we could discuss it here? My response is rather protracted, so I’ve attached it as a pdf file here.

Mark Stuckey replied to the topic Quantum Oblivion and Hesitation in the forum Retrocausal theories 6 years, 10 months ago
I do recall reading Avshalom’s paper. I’ll respond to him about his view. I hadn’t seen Yakir’s paper, thanks for sharing it. Since that represents your view, let’s discuss it.
On pp 78, he writes:
The standard way however is noncovariant as far as the state description is concerned. Indeed, the collapse occurs both at Alice and at Bob at ti…[Read more]

Michael B. Heaney replied to the topic General "Block Universe" Discussion in the forum Retrocausal theories 6 years, 10 months ago
How does the block universe perspective differ from Feynman’s spacetime approach to QM?

Michael B. Heaney replied to the topic A Relativistic Symmetrical Interpretation of the Dirac Equation in (1+1) D (online 7/9 @ 11pm UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Based on a look at the paper you reference, I think the entire 4D phi*psi object is a complete description of reality. Either phi* alone or psi alone are incomplete descriptions of reality.

Michael B. Heaney replied to the topic A Relativistic Symmetrical Interpretation of the Dirac Equation in (1+1) D (online 7/9 @ 11pm UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Consider the classical case of Alice flipping a coin, letting it fall into a box without looking at it, then closing the box. Alice can assign probabilities of 50% it is heads and 50% it is tails. Then Alice opens the box and sees heads. She can now assign a probability of 100% heads for the entire time it was in the box. The same logic applies to…[Read more]

Michael B. Heaney replied to the topic Causality and quantum mechanics (Online 7/15 @ 10 p.m. to Midnight UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Thank you for your explanation!

Michael B. Heaney replied to the topic Causality and quantum mechanics (Online 7/15 @ 10 p.m. to Midnight UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Hi David,
Thank you, that is very helpful.
Suppose Alice has an excited atom that can emit a photon, and Charlie (C) has a ground state atom that can absorb the photon. Alice measures the state of her atom every minute. She finds it in the excited state (H) for the first 3 minutes, then she finds it in the ground state (T) for the next 3…[Read more]

Michael B. Heaney replied to the topic A Relativistic Symmetrical Interpretation of the Dirac Equation in (1+1) D (online 7/9 @ 11pm UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Ken,
My Relativistic Symmetrical Interpretation (RSI) never defines or uses a probability for an experiment after it already has a known outcome! That would make no sense.
Suppose the experiment has been completed. Then the RSI postulates that the complex transition amplitude density phi*(x,t)psi(x,t) is the complete description of what…[Read more]

Mark Stuckey replied to the topic Quantum Oblivion and Hesitation in the forum Retrocausal theories 6 years, 10 months ago
I read both papers, Eliahu. Thanks for making them available for discussion in this workshop. Let me begin by inquiring about your view of the block universe implications of this work.
On page 1 of “Voices,” you seem open to the block universe ontology when you write, “It reformulates Oblivion within timesymmetric interpretations of QM, mainl…[Read more]

Mark Stuckey replied to the topic The toolatechoice experiment: Bell’s proof applied to a timereversed setting in the forum Retrocausal theories 6 years, 10 months ago
I love your twist on EPRB, Avshalom. Entangling the detector direction via beam splitters and post selection is interesting. [Aside: I think you have a typo on p 5, second paragraph. Don’t you mean to “Place detectors on the remaining three ‘up’ SGM exits” instead of “the remaining three ‘down’ SGM exits” in order to complete the measurement for e…[Read more]

Michael B. Heaney replied to the topic A Relativistic Symmetrical Interpretation of the Dirac Equation in (1+1) D (online 7/9 @ 11pm UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Hi All,
I am online for the next hour. Hope to hear from you!
Michael

Michael B. Heaney replied to the topic Causality and quantum mechanics (Online 7/15 @ 10 p.m. to Midnight UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Hi David,
I’m reading your paper, and would like to get an intuitive, physical understanding of what you mean by the words causal, retrocausal, bicausal, acausal, and a correlator. Could you please help?
Thanks,
Michael

Michael B. Heaney replied to the topic A Relativistic Symmetrical Interpretation of the Dirac Equation in (1+1) D (online 7/9 @ 11pm UTC7) in the forum Retrocausal theories 6 years, 10 months ago
Hi Ken,
Thanks for your question!
Let us first review the Conventional Interpretation (CI) of QM: Consider an electron that is localized as a gaussian wavefunction psi(x,0) around x=0cm at t=0s. What is the probability that this electron will later be found localized as a gaussian wavefunction phi(x,10) around x= 25cm at t=10s? The CI calculates…[Read more] 
Michael B. Heaney replied to the topic Retrocausality is intrinsic to quantum mechanics in the forum Retrocausal theories 6 years, 10 months ago
One could argue that the equivalence of the StueckelbergFeynman interpretation to the *standard* QM is evidence that retrocausation is a viable explanation.

Michael B. Heaney replied to the topic Possibilist Transactional Interpretation in the forum Retrocausal theories 6 years, 10 months ago
Thanks, that clarifies it!

Michael B. Heaney replied to the topic Thinking about QM as a variational principle (online 7/9 @ 9am UTC6) in the forum Retrocausal theories 6 years, 10 months ago
Hi Alan,
In your paper, you say collapse does not need to be instantaneous. Won’t this violate the conservation laws?
regards,
Michael

Well, I don’t think so, but if I’ve misunderstood something I’d appreciate your enlightening me. The point is that if I make a measurement (or prepare a state) at time t1 and again at t2 > t1, with no intervening measurement, then I have no experimental evidence for *how* the system got into the state I observe at t2. The Copenhagen interpretation…[Read more]


Mark Stuckey replied to the topic Relational Blockworld: Providing a Realist PsiEpistemic Account of QM in the forum Retrocausal theories 6 years, 10 months ago
Glad to see you here, Ken!
Of course, I believe 4D spacetime can be used to model classical causality. However, the phenomena under consideration here are spacelike separated correlations that violate Bell’s inequality and those phenomena violate classical causality (as articulated by Wood and Spekkens, for example). Obviously, I’m not “de…[Read more]

Mark Stuckey replied to the topic Relational Blockworld: Providing a Realist PsiEpistemic Account of QM in the forum Retrocausal theories 6 years, 10 months ago
I understand you, Silberstein and Wharton discussed this point and concluded that RBW is, in the sense you state, retrocausal. That’s why we say RBW is retrocausal (however deflationary) in the paper. Frankly, I agree with the referee. As we state in the paper, why bother with retrotimeevolved causal stories in a block universe when the entire…[Read more]
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