On Mon, May 5, 2025 at 4:28 PM Alan Grayson <[email protected]> wrote:
> *>> Time is not an operator because it is not an observable in the way > that position, momentum and energy are, instead it's a parameter, the stage > against which things happen. We can say that a particle has a position, a > momentum and an energy but a particle doesn't have a time. Mathematically > that means that in quantum mechanics position, momentum and energy are all > Hermitian operators but time is not. However it remains true that Δt × ΔE ≥ > ℏ/2, and of course Δx × Δp ≥ ℏ/2* > > > *> Your first equation is nonsense* > *No it is not. It expresses a limitation on how quickly a quantum system can evolve between distinguishable states.* *>> It's not my claim, it's the claim of Hendrik Casimir, he used Quantum > Electrodynamics to predict it in 1948, although it wasn't until 1997 that > it was experimentally proven that Casimir's prediction was correct. * > > > *As I read Wiki, Casimir didn't use QED to make his prediction. AG* > *Hendrik Casimir didn't mention the terms "zero point energy" or "virtual particle" in his original 1948 paper because back then quantum field theory wasn't mature and the terms hadn't been invented, but Casimir certainly used quantum electrodynamics. Your original claim was that Casimir didn't even need to use quantum mechanics and that classical physics was sufficient, and that is nonsense. You use R. L. Jaffe's 2005 paper to back up your claim: * *The Casimir Effect and the Quantum Vacuum* <https://arxiv.org/pdf/hep-th/0503158> *However clear as day right there in the abstract Jaffe says Casimir effects "are Relativistic, Quantum forces between charges and currents". * *> it has recently been shown that the Casimir Effect can be calculated > independently of vacuum energy and virtual particles.* *In physics, as in mathematics, things can almost always be derived in more than just one way; and that is especially true if Quantum Mechanics is involved. * *John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis>* #$& -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAJPayv0uNEm2_kd5vy0JFDODiAyM_s4johKb%3DS5c4ex%3DLmejPQ%40mail.gmail.com.
