Everything is ad-hoc. Just guesses until one works. On Tuesday, 29 April 2025 at 16:58:57 UTC+3 Alan Grayson wrote:
> On Tuesday, April 29, 2025 at 4:46:58 AM UTC-6 John Clark wrote: > > On Mon, Apr 28, 2025 at 9:21 PM Alan Grayson <[email protected]> wrote: > > *> Presumably, if Maxwell's equations are solved in empty space, in the > absence of charged particles, the E and B fields will be identically zero.* > > > *Yes.* > > > * > If the same problem is solved in Quantum EM theory, won't we also get > the same classical result,* > > > *No. If the electric, magnetic, gravitational, or any other type of field > was precisely zero then you would know exactly what the energy density was > in any arbitrarily short amount of time, zero. And quantum mechanics says > that is impossible. So the amount of energy must be greater than zero for > short amounts of time, the shorter the time the greater the energy. This is > why there are virtual particles, they can't be detected directly but they > produce effects that can be detected, the simplest and most dramatic is the > Casimir Effect.* > > > *> but then won't the HUP fail to be satisfied?* > > > *I don't know about that but HUP fails to satisfy me because IHA. * > > > Never heard of the HUP, the Heisenberg Uncertainty Principle? How can it > be applied in quantum EM field theory other than on an ad-hoc basis. That > is, can the HUP be derived from the princples of the theory, or is it just > ad hoc? As for the Casimir Effect, it can be predicted classically, so it > proves nothing about virtual particles. AG > -- 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/0fe90d4d-f3f3-4e51-a1ac-f7a7fddc7d83n%40googlegroups.com.
