Massless helicity h particles have angular momentum eigenstates given by spin-weighted spherical harmonics of spin-weight -h, with a sparse multiplet structure that blocks spin-orbital decomposition.
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Spin-weighted spherical harmonics as massless angular momentum eigenstates and their role in obstructing spin-orbital decompositions
Massless helicity h particles have angular momentum eigenstates given by spin-weighted spherical harmonics of spin-weight -h, with a sparse multiplet structure that blocks spin-orbital decomposition.