On 4/29/2025 3:46 AM, 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. *
No, QM says that if you */measure /*the field there is an uncertainty
relation between the energy and duration measured values. Measure also
refers to interactions that imply values.
Brent
*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 butHUP fails to satisfy me because IHA. *
*
*
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
*
*
hqc
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