lördag 10 december 2022

Nobel Prize 2022 for Proving that Einstein was Wrong?


The Nobel Prize in Physics 2022 was awarded to experimental work supposedly finally closing the fierce debate between Bohr and Einstein on the physical meaning of the Wave Function $\Psi$ of Quantum Mechanics QM, with the sounding conclusion:

  • Einstein Was Wrong.   (*)
Bohr represented the Copenhagen Interpretation CI with $\Psi$ representing a probability or possibility of atomic states, while Einstein insisted that fundamental physics as actuality cannot build on playing dice. Bohr said that CI had found its final complete form in the 1920s, while Einstein claimed that something essential named hidden variables was missing. Bohr was younger and more vigorous and won the debate, but Einstein never gave in and his criticism never died. 

A new element was introduced in the 1960s by the young physicist John Bell who showed that outcomes of a CI complemented by any sort of hidden variables must satisfy a certain arithmetic inequality named Bell's Inequality. 

The 2022 Prize is awarded to experiments violating Bell's Inequality, which is taken as evidence that CI cannot be complemented by any hidden variables thus supporting (*). 

But if Einstein was alive today he would still not give in. He could argue: There is a distinction between QM as a general atomistic theory not yet fully formed, and CI as one version of such a theory. Ok, it may be that CI cannot be complemented by hidden variables making it a theory about actuality/reality, but it does not say that this limitation holds for any form of QM. 

The bottom line is that (*) is still open to debate. Get prepared.

You can start listening to Tim Maudlin:
Maudlin points to a misunderstanding by Prize Committee believing that the experiments show (*) in the sense that no "hidden variable" extension of QM is possible, while in fact what the experiments (appear to) show is non-locality or in Einsteins words "spooky action at distance". 

This connects to the earlier discussion about the connection between mass density and gravitational force in Newtonian gravitational theory with last post: Gravitation vs Mass boiling down to view the gravitational potential as primary physical quantity and mass a secondary locally derived quantity.
  

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