Realizations of F4 in SO(3)⊗SO(3) bases and structural zeros of the 6 j-symbol

Abstract
The decompositon of F4 irreps in the group chains F4⊇SO(3)⊗G2⊇SO(3)⊗SO(3) and F4⊇SO(3)⊗Sp(6)⊇SO(3)⊗SO(3) is considered. In both cases a realization of the F4 Lie algebra in terms of SO(3)⊗SO(3) tensor operators is established. From these, the nontrivial vanishing of certain 6 j‐coefficients is explained.

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