Recent content by bhobba

Nothing, It's for those that do not know about it, especially at the I level here or those in later undergraduate years. Thanks Bill

I get it. Thanks Bill

We often see discussions about what QM and QFT mean, but hardly anything on just how fundamental they are to much of physics. To rectify that, see the following...

Perhaps a double major in CS and AI + Data Science? From my 30 years of experience as a computer programmer, these things go up and down. Sometimes all you have to do is be able to spell computer; other times, even with 30 years of experience, it's hard. Thanks Bill

Indeed. https://math.ucr.edu/home/baez/bayes.html 'It turns out that a lot of arguments about the interpretation of quantum theory are at least partially arguments about the meaning of the probability!' Thanks Bill

Yes. But it says that the further separated they are, the more observations are needed to detect that they cannot be factored. I take cluster decomposition to mean experiments can always be separated far enough that, for all practical purposes, it is true. 'Nevertheless, the larger the...

For those who want to investigate consistent histories further: https://quantum.phys.cmu.edu/CHS/histories.html Griffiths (no, not the Griffiths of the standard EM textbook fame) has kindly made his textbook available for free. Thanks Bill

For those following along, you may be wondering how Weinberg accepted the cluster decomposition property, who, without doubt, was aware of Bell. I can't give the details (page number, etc). Still, if I recall correctly, Weinberg addresses this early on in his justly famous Quantum Theory of...

There may be some hope in that direction: https://www.sciencenews.org/blog/context/gell-mann-hartle-spin-quantum-narrative-about-reality That was 10 years ago now—things likely have moved on. Thanks Bill

Aside from the math, of course—that explains it no problem—but 'shut up and calculate' seems to many just a copout (I am one of those many). As usual, excellent post, Peter—cudos. I only want to mention I prefer factorizability to locality, as QM is Bell non-local rather than non-local in the...

One issue is going from basic non-relativistic QM to QFT. Our own Demystifier examines some of the issues: https://arxiv.org/abs/2205.05986 Thanks Bill

And many, like me, think that is because we have no DIRECT experience with the quantum world. It is tough to apply how we think about the world, shaped by experience in the macro world, to something we have no experience of. Even further, the Effective Field Theory approach to QFT seems to be...

Too true. I have had numerous similar experiences during my 30-year stint in IT. A lot were more of a laugh than anything else, but some, like the above, could have ended in disaster. Even worse were those that made my life worse. Self-serving - of course :DD:DD:DD:DD:DD:DD Thanks Bill

The one that requires a yearly fee because it includes the AI. There is one available for a one-time payment of approximately $20.00, excluding the AI. Thanks Bill

How true it is. At one time, I was the computer security officer for the Australian Federal Police (by law, every government agency had to have one, and I was it, until the head of IT decided, correctly IMHO, it was really his responsibility, and I reported to him on security matters while...