Recent content by gentzen

pines-demon quoted from Sidney Coleman's Dirac Lecture "Quantum Mechanics in Your Face" (https://arxiv.org/abs/2011.12671) and martinbn added "the full quote" of what Sidney Coleman said before (and refers to here) to make things clearer: Sidney Coleman's opinion on interpretation in these...

Why don't you open a new thread, when you want to discuss about QBism? Of course there have been discussion threads about QBism here. The most recent ones seem to be: https://www.physicsforums.com/threads/qbism-vs-copenhagen-what-is-the-difference.974602/post-6205455 (Jul 12, 2019)...

Did Sidney Coleman ever bother to clarify which parts or properties of classical mechanics are in need of interpretation or explanation? One part is classical locality, I guess Another part could be classical definiteness, for which MWI offers possible explanations or interpretations Another...

I am not really active at https://www.physicsforums.com/forums/atomic-and-condensed-matter.64/ From time to time I think that I should, read some of the question, but then each of the questions feel like they would cost me quite some time, and the last activity is often months in the past. My...

I think we should be more critical towards people like Niels Bohr (and also John Bell) who insist on never saying or writing anything wrong. Maybe Werner Heisenberg was a bit too cavalier, but I still like the following passage from "Physics and Philosophy" (1958):

Even this part is not so clear: I probably asked one specific instance of those "continuity properties" even more explicitly somewhere, but that might not be overly important. It seems other people have at least started to provide that missing analysis: I now read section "3 Short-time...

You mean https://arxiv.org/abs/2602.07402 (The ABL Rule and the Perils of Post-Selection)? Your formulation sounds like you talked about that paper before, and now want to add a new criticism. I find it very fitting that your post is overly long. After listening to some podcasts and videos with...

I guess you meant (copy&paste mistake): https://arxiv.org/abs/1712.06605

As long as you are requiring exact symmetry, my answer to QuarkyMeson above provides one answer: If everything is exactly symmetric down to the last detail, then one can simply take the quotient and get a reduced description. So this means that only the FAPP situation is interesting for your...

So the small part broke the symmetry, no? And not just for itself, but globally! Or maybe not, if we assume that another indistinguishable small part also exist, as required by the symmetry under that 180° spatial rotation about a fixed axis. The interesting question is what "indistinguishable"...

A frequently used model has an effectively asymmetric environment: No idea whether you could come up with a model with an environment respecting your 180° spatial rotation about a fixed axis. The points 1. - 4. seem unproblematic to me. Point 5. should be unproblematic too, depending on how...

Here is the relevant passage from the paper (bold emphasis by me): Alfred Landé and Werner Heisenberg had defended such half-integral quantum numbers in 1921. This caused skepticism and critique. I would interpret this passage as a defence of that earlier work, hinting that it had always been...

Are you sure that it is on page 12? I couldn't find it there. And I am too lazy to ocr this document to make it searchable.

You know https://arxiv.org/abs/quant-ph/0608140 (1951 Lectures on Advanced Quantum Mechanics Second Edition by Freeman J. Dyson)? But of course, even if you don't know this text, you certainly know these arguments. But maybe the last bold sentence above (bold by me) helps you at least a bit...

I guess there are not too many things to do with them. You could analyse their position-momentum uncertainty, you could analyse the 2D or 3D harmonic oscillator and its radial symmetry. And maybe two or three other things, but then it soon gets boring. Plane waves are simply more interesting...