On 4/29/2025 3:14 PM, John Clark wrote:
On Tue, Apr 29, 2025 at 4:53 PM Brent Meeker <[email protected]>
wrote:
*>> 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./
*If you place two macroscopic conductive plates close to each otherthe
Casimir Effect will cause the two plates to attract each other; this
occurs regardless of if you make any measurements or not. It happens
because there are fewer virtual particles between the two plates than
there are outside the plates. And virtual particles exist because it's
impossible for the energy in the electromagnetic field to be exactly
zero for any arbitrary length of time; and the shorter the time the
greater the deviation from zero it's likely to be. *
That's why the qualification about measure like interactions. The two
conductive plates exclude longer wavelengths. I don't recall that the
effect depended on duration. There are a lot of different forces
between plates near one another that have been referred to as Casimir
effects. Here's a review article,
https://courses.physics.ucsd.edu/2014/Fall/physics215a/project/Casimir-Review.pdf
Brent
*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
*
*
hjd
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