Monday, August 9, 2021

Aharonov, Popescu, Rohrlich (2021): On conservation laws in quantum mechanics

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Yakir Aharonov, Sandu Popescu, and Daniel Rohrlich have an interesting paper On conservation laws in quantum mechanics  (January 5, 2021, PN...
Saturday, August 7, 2021

A running coupling constant breaks the classical limit and energy conservation?

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UPDATE August 20, 2021: In the discussion below we did not analyze the fact that the fine structure constant α, too, changes if we change th...
Thursday, August 5, 2021

Vacuum polarization, vertex function, self-energy: are there classical analogues?

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UPDATE August 29, 2021: In our August 27, 2021 post we found a classical analogue for vacuum polarization. If we have a solid, for which ele...
Wednesday, August 4, 2021

Bethe and Heitler (1934) and production of pairs instead of bremsstrahlung

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Let us then analyze pair production in the Bethe and Heitler 1934 paper: https://royalsocietypublishing.org/doi/10.1098/rspa.1934.0140 Pair ...
Tuesday, August 3, 2021

Bremsstrahlung: why a large value of the Planck constant makes it weak?

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Let us continue our study of bremsstrahlung. We think we have found the explanation why a big Planck constant h makes the cross section smal...
Sunday, August 1, 2021

Which scattering cross sections depend on the value of the Planck constant?

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The 1934 bremsstrahlung paper by Bethe and Heitler is freely readable at  https://royalsocietypublishing.org/doi/10.1098/rspa.1934.0140 Beth...
Thursday, July 29, 2021

The fine structure constant: an update

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In our previous blog post we claimed that in a classical model an electron might  lose most of its kinetic energy if it passes the proton at...