Re: What is "uncertain" in quantum physics?

On 19/05/2025 11:07, Julio Di Egidio wrote:

On 19/05/2025 03:10, x wrote:

On 5/18/25 10:28, Julio Di Egidio wrote:

Why shouldn't we think of the Uncertainty Principle as just a statement
about the limits of observation, rather than about something objective,
especially as in causing some non-zero vacuum energy?
>
Is there some experiment that settles "uncertainty" as something "really
there"?  In particular, I am not sure if the expansion of the Universe
is such evidence, or rather a consequence of the theory.
>
Thanks for any insight.

>
Interesting.  A statement or question actually
about physics.

 LOL, indeed.
 

If something is 'quantized' in quantum mechanics
it is actually there [and] not there.
>
Take an electron.  It actually has a specific
rest mass or charge.  It does not have an infinite
number of fine degrees of mass or charge.

 But quantisation has nothing to do with uncertainty.
 Unless you are thinking of quantising space-time...?

I.e. space-time dimensions: so no, at least not until
further notice, as those remain in a first instance
descriptions of observation, the "frames of reference".
-Julio