In a problem I might want to work one, I would find myself having to work explicitly with hyperspherical harmonics on a three-sphere and their tensor decomposition. It’s well known that $S^3$ can be expressed as the total space of a non-trivial $U(1)$ bundle over the sphere $S^2$. My question is whether someone has tried to extend the spherical harmonics $Y_{lm}$ on $S^2$ to hyperspherical harmonics by replacing them with suitable sections of a bundle over the $S^2$ base?
2026-03-25 19:04:30.1774465470
$S^3$ hyperspherical harmonics in terms of spherical harmonics
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