


Lee Smolin replied to the topic A reasonable thing that just might work in the forum John Bell Workshop 2014 8 years, 4 months ago
Hi Ken,
Do these interesting results imply that if one doesn’t want to admit retrocausality in quantum physics one must also deny time reversal symmetry? At what level must one give up time reversal symmetry? Must unitary time evolution or the Schroedinger equation be modified?
Thanks,
Lee

Lee Smolin replied to the topic Nonlocal beables in the forum John Bell Workshop 2014 8 years, 5 months ago
Dear Dieter,
Thank you for your remarks. I couldn’t disagree more, on substance as well as methodology. First, I don’t agree that the Everett interpretation is “inferred” rather than invented. Without an operational hypothesis as to how the mathematical symbols correspond to measured values a theory, any theory, is just empty mathematical…[Read more]

Lee Smolin replied to the topic Nonlocal beables in the forum John Bell Workshop 2014 8 years, 5 months ago
Dear Dieter,
I’m sorry, I misunderstood you; I thought by referring to the wavefunction, as an alternative to hidden variables, you were referring to dBB.
Everett Many Worlds fails to answer any of the questions that puzzle me about quantum physics. I can elaborate my objection to it but others such as David Albert have already done a…[Read more]

Lee Smolin replied to the topic Nonlocal beables in the forum John Bell Workshop 2014 8 years, 5 months ago
Dear Dieter,
I certainly do want to avoid many worlds. For reasons we explain in our new book with Mangabeira Unger, I don’t think that the present framework of quantum theory can apply to the universe as a whole.
I agree the wave function contains more than a probability distributionits phase appears to be “ontic”. But I don’t like that…[Read more]

Lee Smolin wrote a new post, Nonlocal beables 8 years, 5 months ago
I would like to begin with Bell’s remark on the possibility that the beables are nonlocal, which Tim Maudlin quotes.
“Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].”
When I read that yesterday I was astounded because it made me realize that ever since encountering Bell’s theorem as a first year undergraduate I have assumed that there are nonlocal beables; indeed most of my work in quantum foundations has been a search for them.
The model I have sketched shows that quantum mechanics can be recovered from an explicit hidden variables model whose beables are nonlocal. This is in accord with the reasons I stressed that the beables of quantum theory should be taken as nonlocal. I would thus propose that the ultimate legacy of Bell’s fundamental work will be the discovery that quantum theory is a description of an alocal world, which we happen to see in a phase where space has emerged. When we try to describe the physics of local subsystems of the universe, delineated by the emergent and approximate concept of locality, we are forced to neglect interactions which are really there between the subsystem’s microscopic degrees of freedom and other degrees of freedom now emerged in distant parts of the universe. These nonlocal interactions are mediated by relational degrees of freedom that are nonlocal, in the sense that they are shared between subsystems that are distant from each other in the emergent concept of locality.
Because of the neglect of these nonlocal degrees of freedom, the quantum physics of local subsystems is stochastic and subject to a persistent and universal Brownian motion, which is the cheshire cat smile of the fundamental alocality of the world. In this sense, hbar is a measure of the resistance of the world to a local description.

Lee Smolin started the topic Nonlocal beables in the forum John Bell Workshop 2014 8 years, 5 months ago
I would like to begin with Bell’s remark on the possibility that the beables are nonlocal, which Tim Maudlin quotes.
“Of course, we may be obliged to develop theories in which there are no strictly local beables. That possibility will not be considered here[1].”
When I read that yesterday I was astounded because it made me realize that ever sin…[Read more]

Lee Smolin joined the group John Bell Workshop 2014 8 years, 5 months ago

Lee Smolin commented on the post, Precedence and freedom in quantum physics 8 years, 6 months ago

Lee Smolin replied to the topic Panel Discussion: How to make sense of the wave function? [Friday, EDT (UTC4): 3pm5pm] in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Bob,
Many thanks for your comments. My first response is that I don’t think that the REF has the issue with retrodiction you mention, but I’ll look into it.
I haven’t thought through your consistent histories framework carefully in many years so I will take your invitation to do so again. At one time there was an argument by Dowker and…[Read more]

Lee Smolin replied to the topic Panel Discussion: How to make sense of the wave function? [Friday, EDT (UTC4): 3pm5pm] in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Shan,
I agree with you strongly. But deciding that the wavefunction is ontic, while very important, is of course not the end of the discussion, it is the beginning. It opens up the floor for us to propose hypotheses as to what beables the wave function corresponds to. Quantum mechanics doesn’t tell us, because of the measurement p…[Read more]

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Shan,
Sure, as I wrote, the theory can be tested by doing exactly what you say: construct a multiparticle entangled state of many degrees of freedom that would be very improbable to have been created naturally. If nonetheless the Schroedinger equation is satisfied that is evidence against the real ensemble formulation. Or you could try to…[Read more]

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Ken,
Thanks so much for your response. Again, I’llgo point by point:“After reading through some of the PIRSA slides, I think I see the bigpicture of what you’re attempting here… and I certainly appreciate that having Hamilton’s Principal Function as the phase of the wavefunction might invoke an interpretation where the distant past is d…[Read more]

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Bob,
Thanks enormously for your interest. Let me answer your questions in sequence:
“Can you say a bit more about what is driving your ideas? Obviously there is some discontent with quantum mechanics as currently formulated, but what is it that you think you can improve on?”
I am driven by the now more than 40 year failure to go beyond…[Read more]

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
Dear Shan,
Thanks for your interest and question. You raise an important issue which is the definition of the ensembles corresponding to the quantum state. These are defined to consist of similarly prepared systems with similar external environments and the same constituents. The crucial issue, which I do address in section 6 of the paper as…[Read more]

Lee Smolin changed their profile picture 8 years, 7 months ago

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
I am having difficulty uploading the pdf of the talk, but interested participants can download the pdf of a similar talk from http://pirsa.org/13050072/

Lee Smolin replied to the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
The file of the talk is attached here:

Lee Smolin started the topic The real ensemble formulation of quantum theory in the forum First iWorkshop on the Meaning of the Wave Function 8 years, 7 months ago
The real ensemble formulation of quantum theory
Lee Smolin
I would like to describe an approach to the quantum measurement problem I invented a few years ago, called the real ensemble formulation. I am uploading the pdf of a talk, viewers who want to watch a very similar talk may look at either http://pirsa.org/13050072/ or…[Read more]
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