An extremely useful relation between the Kronecker delta and the Levi-Civita symbol.
The brackets mean that we completely anti-symmetrize in the indices m,npic.twitter.com/Hp8tK8qZ3D
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Mr Laurens Gunnarsen, could you please kindly clarify what you said a bit more? Do you have more lead, or? Thank you.
The fundamental dynamical variables of gauge theories are connections on principal fiber bundles over spacetime. Attempts to make GR fit into this framework tend to focus on the frame bundle. But the frame bundle is no ordinary fiber bundle over spacetime. It's extremely special.
Agree, it is not a gauge theory in the usual sense. But it is still a gauge theory. And regarding the internal and spacetime symmetries, Coleman-Mandula's "No Go" theorem led to supersymmetric gauge and supergravity theories. https://arxiv.org/abs/gr-qc/9907078 …
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