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Spin-weighted spherical harmonics as massless angular momentum eigenstates and their role in obstructing spin-orbital decompositions
Eric Palmerduca, Hong Qin
We show that for massless helicity particles, the angular momentum eigenstates are given in an appropriate coordinate system by the spin-weighted spherical harmonics ${_{-h}Y_{…
math-ph2025★ 2 cited
Zero curvature is a necessary and sufficient condition for a spin-orbital decomposition
Eric Palmerduca, Hong Qin
There has been an extended debate regarding the existence of a spin-orbital decomposition of the angular momentum of photons and other massless particles. It was recently shown tha…