# Weinberg soft photon theorem and its expansion on nonabelian case

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Weinberg soft photon theorem states that the only way to construct Lorentz-covariant theory of interaction of photons with the other particles by inversed square law is to introduce gauge invariant interaction. Does this theorem hold for nonabelian extensions? I.e., for Lorentz covariant theory of interaction of gluons with matter we need to introduce nonabelian gauge symmetry of interaction term.

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