A presenter recently said this at a colloquium, but they didnt explain why. I know a fair bit of GR and Yang-Mills theory, so dont shy away from the details (unless they are cumbersome and don't aid in understanding).

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    $\begingroup$ Answered here. physics.stackexchange.com/a/78999/66086 $\endgroup$ – Cosmas Zachos Feb 1 at 3:56
  • $\begingroup$ @CosmasZachos Not a good answer. Just a verbal description of a mathematical formula with no physical meaning given. May do for the OP, but meaningless for 99% users here. $\endgroup$ – safesphere Feb 1 at 8:10

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