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Quantum Speculations started the topic in the forum 8 years, 10 months ago
The quantization of a theory with an infinite number of degrees of freedom, such as a field theory, leads to unitarily inequivalent representations of the canonical commutation relations. The occurrence of inequivalent representations is widely acknowledged as a grave obstacle for interpreting QFT ontologically. One possible stance is to dismiss…[Read more]
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Quantum Speculations started the topic A Conjecture on the Origin of Gravity in the forum Foundations of quantum gravity 8 years, 10 months ago
In this paper, we argue that a certain kind of discreteness of space-time may imply the existence of gravity as a geometric property of space-time described by general relativity (GR). In particular, the dynamical relationship between matter and space-time holds true not only for macroscopic objects, but also for microscopic particles. This…[Read more]
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Shan Gao replied to the topic What Retrocausal Explanations Look Like (Online Tues. 1/13, 11:30am PST) in the forum John Bell Workshop 2014 9 years, 3 months ago
Hi Ken,
Many thanks for your reply and explanation! I would like to learn more details about your retrocausal theory by reading these two papers.
Best,
Shan -
Shan Gao replied to the topic What Retrocausal Explanations Look Like (Online Tues. 1/13, 11:30am PST) in the forum John Bell Workshop 2014 9 years, 3 months ago
Hi Ken,
This is a very interesting paper. I would like to know whether a retrocausal explanation has the ability to derive the Born rule. I think this question is closely related to the missing account of how a future measurement setting influences the measured system physically (which has been referred to by you). It seems that only after we…[Read more]
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Shan Gao replied to the topic A new proof of nonlocality in standard quantum mechanics in the forum John Bell Workshop 2014 9 years, 3 months ago
I think my new strategy to prove nonlocality may be more helpful for understanding the nature of nonlocality, e.g. determining whether the nonlocality requires the existence of a preferred Lorentz frame.
It is noncontroversial that the existence of the above hypothetical superluminal signaling is incompatible with the theory of relativity, and it…[Read more]
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Shan Gao replied to the topic A new proof of nonlocality in standard quantum mechanics in the forum John Bell Workshop 2014 9 years, 3 months ago
Hi Shelly,
Thanks again for your further comments! I still think my proof of nonlocality does not depend on the meaning of the wave function. No matter the wave function is epistemic or ontic or something else, the wave function may be changed in a linear way by an usual external potential according to the Schrodinger equation, and it is also…[Read more]
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Quantum Speculations replied to the topic Local Causality, Probability and Explanation (Online 12/30 @ 2 p.m. UTC – 7 ) in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Richard,
Many thanks for your kind reply! I will consider my argument more deeply. But I still have a question for your reply. I think the existence of precise anticorrelation requires that the wave function of the photon on every side need to be collapsed as in standard quantum mechanics. I would like to know what you think about this…[Read more]
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Quantum Speculations replied to the topic Local Causality, Probability and Explanation (Online 12/30 @ 2 p.m. UTC – 7 ) in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Richard,
I have a short comment on your very intriguing paper. It seems that in your formulation of QM there is still the collapse of the wave function, though the wave function is not ontic. Then it seems that my new proof of the quantum nonlocality also applies to your theory. My proof does not depend on the meaning of the wave function,…[Read more]
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Shan Gao replied to the topic Bell on Bell’s theorem: The changing face of nonlocality in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Dieter,
Thanks for your clarification! I will look at your paper later.
Best,
Shan -
Shan Gao replied to the topic Bell on Bell’s theorem: The changing face of nonlocality in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Travis,
I agree that finding an image of the familiar 3D world is an issue for the Everettians. I also hope Chris can clarify some of these things.
Best,
Shan -
Quantum Speculations replied to the topic A new proof of nonlocality in standard quantum mechanics in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Shelly,
Many thanks for your very helpful comments on my new proof of Bell’s theorem. You pointed out a very important potential issue, and I should have clarified my argument concerning this point. Here are my answers.
First of all, as you may admit, when assuming that the wave function is ontic, my proof is valid. I think this is still…[Read more]
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Shan Gao replied to the topic Bell on Bell’s theorem: The changing face of nonlocality in the forum John Bell Workshop 2014 9 years, 4 months ago
PS. It is a fundamental and widely accepted assumption that a measurement result exists universally, and in particular, it exists for every observer, independently of whether the observer makes the measurement or knows the result. But the Everettian theory violates this assumption.
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Quantum Speculations replied to the topic Bell on Bell's theorem: The changing face of nonlocality in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Travis,
I think the authors are right in suggesting that the correlations in question don’t yet exist (when the state is 0.9) but do exist (when the state is 0.10). The reason is that in Everettian theory a measurement result exists only relative to the systems which are decoherent with respect to the measurement result, and it does not e…[Read more]
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Quantum Speculations replied to the topic Measurement and Macroscopicity (Online 12/22 @ 11 a.m. UTC-4) in the forum John Bell Workshop 2014 9 years, 4 months ago
Hi Gregg,
I fully agree with Bell and you that if quantum theory is to serve as a truly fundamental theory, conceptual precision in its interpretation is not only desirable but paramount. In my view, even in current realistic quantum theories, there is still conceptual imprecision. For example, in collapse theories favored by me, the source…[Read more]
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Shan Gao started the topic A new proof of nonlocality in standard quantum mechanics in the forum John Bell Workshop 2014 9 years, 4 months ago
Consider a EPRB experiment in which there exists an ensemble of two spatially-separated and spin-1/2 particles (labelled 1 and 2) prepared in a spin singlet state. The spin of particle 1 is measured along two possible directions, a and a’, and the spin of particle 2 is always measured along the same direction $b$. Moreover, the two spin…[Read more]
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Quantum Speculations joined the group John Bell Workshop 2014 9 years, 4 months ago
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Shan Gao replied to the topic A PBR-like argument for psi-ontology in terms of protective measurements in the forum First iWorkshop on the Meaning of the Wave Function 9 years, 5 months ago
Hi Matt,
Thanks for this! I look forward to reading your final paper.
Yes, I agree that “the operational argument does not depend in any way on what the protective measurement scheme tells Bob to do.”
But in your note, you say: “But since protective measurement uses exactly the same resources, how can it lead to a radically different conclusion…[Read more]
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Shan Gao replied to the topic A PBR-like argument for psi-ontology in terms of protective measurements in the forum First iWorkshop on the Meaning of the Wave Function 9 years, 6 months ago
Here is my further idea (gotten on the bus to my office), which shows that there are more differences:
(1) The first one concerns the weak measurements (with readouts). These weak measurements result in strong wavefunction collapse. Here the strongness means that the probability to collapse most of the outcome states is large, although the…[Read more]
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Shan Gao replied to the topic A PBR-like argument for psi-ontology in terms of protective measurements in the forum First iWorkshop on the Meaning of the Wave Function 9 years, 6 months ago
Dear Matt,
I must say that your scheme let me think more deeply about PM. I am very grateful to you for this.
I think we should not make assertions quickly; we need a more careful analysis and more effective discussions, especially because we have different opinions from the beginning.
Here is my current thoughts:
1. Your scheme is not the…[Read more]
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