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 Originally Posted by mojo
I wonder if there's anything I can possibly say that will make you believe that the only thing the Plank length tells us is that our model stops working in the limits of the very very tiny. It makes no predictions.
I wonder when it will dawn on you that the Planck length is more than just a length!
https://www.youtube.com/watch?v=bjVfL8uNkUk&t=2s
Maybe Arvin can explain better than I can. Skip to 6 minutes if you don't want to be patronised.
He is at pains to point out that we simply do not know what happens at sub-Planck scales. However, it's not a question of measurement accuracy, it's a fundamental limit at which our models stop working. Our 4-dimensional model of the universe doesn't work at sub-Planck scales. That means length as we understand has absolutely no meaning. It's not a math trick, no more than c or g are math tricks. It's a fundamental constant of nature.
If an object is perfectly rigid, then it cannot experience length contraction
I need to think this one through!
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