Demystifier's latest activity

That potential, if you try to think of it as valid for all ##r## out to infinity, is an idealization and never actually happens, just as...

I think that you can say that a bound state must have lower energy than an unbound state, regardless of where you set the zero.

All this depends on where you set the "zero point" of energy--and you've implicitly made different choices for the two cases you...

Indeed. For a relatively simple explanation why and how Casimir effect originates from van der Waals forces see my...

I don't think the Casimir effect does, no. My limited understanding is that it can be rewritten as an effect of van der Waals forces...

Hossenfelder has blogged about the article, called it mathematically erroneous (actually, she was somewhat blunter :smile: ).

Today I learned that Terry Rudolph, the R from the famous PBR theorem, is a grandson of Erwin Schrodinger and his mistress...

https://arxiv.org/abs/2412.02742 "Dynamical formation of regular black holes", Pablo Bueno (Spain). In this case, they construct the...

I have not studied the papers in detail, but at a first look the critique looks much more plausible.

Critique of the article: https://arxiv.org/abs/2605.02621 I would need some time to find out whether the article is wrong or the critique...

If the Hamiltonian has a continuous spectrum, then, in the canonical ensemble with non-zero temperature, any given energy has non-zero...

You are right that any state with definite energy has zero probability in that sense. But there is nothing wrong with that conclusion...

I think there were a few, but I can find only this one: https://www.physicsforums.com/threads/quantum-mechanics-myths-and-facts.143045/

Hi What is the relationship between superconductors and gravity? Eugene podkletnov came up with some interesting findings. The first...

Thank you @Demystifier 1. I observe that a. ## \bar{g}_{\mu\nu}-g_{\mu\nu}## transforms as a covariant tensor under coordinate...