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Apr24-11, 10:10 AM
Sci Advisor
P: 5,451
Quote Quote by fzero View Post
The modern presentation, which I'm sure you're aware of is to find the field that provides an irreducible representation of the Poincare group. Then one writes down all Poincare invariant terms ...
You have to do that for each spin 0, 1/2, 1, 3/2, ... seperately and you don't get any relations between them. Thanks for the SUSY/SUGRA idea, perhaps this is the only way out.