11 citations · 29 across the 10 of their papers we have counts for
6 papers · 1 filter
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_{…
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…
Helicity is a topological invariant of massless particles: C=-2h
Eric Palmerduca, Hong Qin
There is an elementary but indispensable relationship between the topology and geometry of massive particles. The geometric spin is related to the topological dimension of the…
Four no-go theorems on the existence of spin and orbital angular momentum of massless bosons
Eric Palmerduca, Hong Qin
The past decades have seen substantial interest in the so-called orbital angular momentum (OAM) of light, driven largely by its diverse range of applications. However, there are fu…
Graviton topology
Eric Palmerduca, Hong Qin
Over the past three decades, it has been shown that discrete and continuous media can support topologically nontrivial waves. Recently, it was shown that the same is true of the va…
Photon topology
Eric Palmerduca, Hong Qin
The topology of photons in vacuum is interesting because there are no photons with , creating a hole in momentum space. We show that while the set of all photons…