
Ruth Kastner replied to the topic Quantum theory is incompatible with relativity: A proof beyond Bell's theorem in the forum 2019 International Workshop: Beyond Bell's theorem 1 year, 9 months ago
Hi Shan:
I’ve started looking at this interesting paper, but I do have to note that there is an exception to the general observation that ‘Collapse theories single out a preferred frame’. The Transactional Interpretation is a collapse theory, but it does not single out a preferred frame. This is made explicit in its relativistic development, RTI,…[Read more] 
Ruth Kastner started the topic UnitaryOnly Quantum Theory Cannot Consistently Describe the Use of Itself in the forum 2019 International Workshop: Beyond Bell's theorem 1 year, 9 months ago
There has been much discussion about the FR paradox, but to my knowledge, it has not yet been considered that the paradox is a consequence of the traditional assumption that quantum theory ‘really’ has only unitary dynamics; i.e., that there is no ‘objective reduction’ or physical nonunitarity in QM. Here it is argued that it is the unitaryonly…[Read more]

Quantum Speculations started the topic Closing the superdeterminism loophole in Bell's theorem in the forum 2019 International Workshop: Beyond Bell's theorem 1 year, 9 months ago
http://philsciarchive.pitt.edu/16203/
It is well known that there is a freedomofchoice loophole or superdeterminism loophole in Bell’s theorem. Since no experiment can completely rule out the possibility of superdeterminism, it seems that a local hidden variable theory consistent with relativity can never be excluded. In this paper, we…[Read more]

Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Thanks Richard, let me address your comment that:
… if there were no true magnitude claims then an application of the Born rule would have nothing to which to assign probabilities!
The above statement/position depends on the notion of ‘magnitude claim’. That’s a linguistic entity, and I think we earlier agreed that QM doesn’t demand or depend…[Read more]

Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Mark: of course, I’ve contended and continue to contend that the disease infecting conventional approaches to QM is that nobody can define ‘measurement’. This leaves adherents of these traditional approaches to simply help themselves to measurement results. In particular, I would have to respectfully differ with Richard’s comment:
The argument…

Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Thanks very much Richard.
Of course, in the transactional picture, once photons are detected/actualized (as is necessary to yield a current), collapse has occurred, and conserved quantities (such as angular momentum, spin, etc) have been transferred. (Photons are the mediator of em processes such as the creation of electron current; for details,…[Read more] 
Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Thanks very much, Richard.
Regarding the interpretation of probability, it seems that this is still an open question. I don’t think the Born probability is restricted to being about semantic objects such as claims. It can be directly about a system’s actualized properties (at least it certainly can in TI).
But in any case: I recognize that…[Read more] 
Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Richard, do I understand correctly that in your proposed approach, measurement outcomes have no relation to values of observables for the system? My question arises from your statement:
In particular, it makes no assumption concerning the actual spin values of the measured particles, either before or after the spin measurements. It assumes only…

Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Thanks, Richard for this clarification.
Of course, I think your analysis can also perfectly well apply to an ontic role for the quantum state.
Under an epistemic view of the quantum state, then it seems to me that if one posits that measurements really do have definite outcomes, then an implicit hidden variable view must be lurking in the…[Read more] 
Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
This is an interesting situation: assessments of the bearing and validity of the FR proof greatly depend on what quantum theory itself is taken to be. For example, Editor has referred to two different forms of QT:
(1) QT with collapse postulate — call it “QTCP”
(2) QT without collapse postulate — call it “QTNCP”
…and has noted, based on…[Read more] 
Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
I would just comment here that Brukner’s formulation of the measurement problem presupposes an epistemic interpretation of the quantum state relative to a particular observer. So his analysis and conclusions do not apply to cases in which the quantum state ontologically refers. In particular, he concludes that facts are necessarily…[Read more]

Ruth Kastner started the topic How we avoid getting to the Wigner's Friend situation in the first place in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
The Wigner’s Friend scenario was created to amplify the measurement problem as illustrated by Schrodinger’s Cat. We don’t encounter a Wigner’s Friend dilemma in the first place if we have a means of delineating, in physical terms, what constitutes ‘measurement’ (where that is described by von Neumann’s Process 1 nonunitary transition)…[Read more]

Ruth Kastner replied to the topic Is there an inconsistent friend? in the forum Workshop on Wigner’s Friend 2018 2 years, 6 months ago
Dear Editor: Should I start a new topic to address the measurement problem, which is what is being illustrated by the Wigner’s Friends scenario? In particular, we don’t encounter a Wigner’s Friend dilemma in the first place if we have a means of delineating, in physical terms, what constitutes ‘measurement’ (where that is described by von…[Read more]

Ruth Kastner posted an update in the group 2018 Workshop on Wigner’s Friend 2 years, 6 months ago
May I add as a relevant reference:
Kastner, R. E. On the Status of the Measurement Problem: Recalling the Relativistic Transactional Interpretation
International Journal of Quantum Foundations, 2017,
Volume 4, Issue 1, pages 128141
I would just note that RTI is not subject to the recent ‘nogo’ proofs since it does not assert that quantum states are universally applicable; rather it has a natural limiting criterion for the applicability of quantum states. It particular, neither the Geiger counter nor the cat nor Wigner nor his friend (understood as spacetimelocatable obj…[Read more]


Ruth Kastner joined the group 2018 Workshop on Wigner’s Friend 2 years, 6 months ago

XinZhong Wu and editor are now friends 2 years, 9 months ago

XinZhong Wu posted an update 2 years, 10 months ago
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Dear Roger Penrose,I am glad to meet you in this quantum website. I have read your books such as ‘Roads to Reality’, and study in spacetime philosophy and quantum mechanics interpretations.
Xinzhong Wu 
XinZhong Wu posted an update 2 years, 10 months ago
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Quantum Speculations replied to the topic A New Ontological Interpretation of the Wave Function in the forum Meaning of the wave function 3 years ago
Further comments are welcome!
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