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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2Answered here. https://physics.stackexchange.com/a/78999/66086 – Cosmas Zachos Feb 01 '19 at 03:56
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@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. – safesphere Feb 01 '19 at 08:10