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You could try to browse Dirac's collected papers Cambridge U. - https://archivesearch.lib.cam.ac.uk/repositories/9/resources/1531...

This reminds me of a very old post of mine (reconstructed here because the old-style LaTeX on PF appears broken): It might be...

Is this the paper you seek? From the WIkipedia article.... Bel, L. (1958), "Définition d'une densité d'énergie et d'un état de radiation...

Here's a 2025 interview with Abhay Ashtekar (Penn State), split into parts. (I was especially interested in his stories with Robert...

So are we! :welcome:

MENTOR NOTE: This thread has been split into two parts. This part discusses the Static Equilibrium and is now closed, while the...