How do you read the QED, QCD and standard model Lagrangians? What do all the symbols and tensors represent? And, how can you derive them by yourselves?


closed as too broad by John Rennie, Brandon Enright, akhmeteli, Waffle's Crazy Peanut, user10851 Nov 17 '13 at 22:38

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    $\begingroup$ QFT textbook will explain the meaning of the symbols and tensors. It is not really a derivation to find these Lagragnians. It is postulated by educated guess and experimental evidence (e.g. parity non-conservation) $\endgroup$ – user26143 Nov 17 '13 at 7:31
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    $\begingroup$ @DIMension10 I would like to regard writing the interaction terms by gauge invariance as an educated guess $\endgroup$ – user26143 Nov 17 '13 at 15:21
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    $\begingroup$ There is an answer at physicsoverflow.org/5191 $\endgroup$ – Arnold Neumaier Jul 11 '15 at 7:35