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Aug 26, 2023 at 16:12 comment added JEB I look at is as low frequency modes are cutoff between the plates, and the closer the plates, the more are missing. It’s then energetically favorable for the plates to be closer. I think the experiment that needs to be done is to measure the fluctuations in the force, but idk if that has been done.
Aug 11, 2023 at 1:39 comment added Paradoxy +1 But to just play devil advocate, I would like to say that, even when we are dealing with free EM fields (so no perturbation theory), the expectation value of E/B fields are zero in vacuum state, but their variance isn't. In fact, it diverges! So how do we explain this phenomena? Virtual particles paired with uncertainty principle can give an intuitive explanation. They can even exert finite force on extended "classical" large objects, the so called Casimir effect. So they are as real as holes, or phonons, not just some artifact from an old approximation.
Aug 10, 2023 at 16:59 history answered JEB CC BY-SA 4.0