Demonstrates a projection operator for angular momentum eigenspaces, indicating its use in nuclear structure studies.
The Frobenius covariant is used to construct a projection operator onto the spin-S eigenspaces associated with the squares of the total and orbital angular momenta. The covariant admits two equivalent representations: as a polynomial in powers of the scalar product of the spin and orbital angular momentum operators, and as a finite expansion in terms of their respective polarization operators. A correspondence is established with Villars’ angular momentum projection, used in nuclear structure studies.
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M. I. Krivoruchenko (2026) studied this question.
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