spinweighted
Spin-weighted quantities are a concept used in theoretical physics, particularly in the study of general relativity and cosmology. They are related to fields that transform under the representation of the Lorentz group, specifically with a spin number. A quantity with spin weight $s$ transforms in a particular way under Lorentz transformations. The spin weight can be an integer or half-integer. For example, scalars have spin weight $s=0$, vectors have spin weight $s=1$ (when considered as antisymmetric tensors under rotation), and spinors have spin weight $s=1/2$.
The formalism of spin-weighted quantities allows for a unified treatment of various fields. For instance, derivatives
Spin-weighted spherical harmonics are also important, serving as a basis for functions on the sphere that carry