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## New answers tagged tensor-calculus

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### Why is the $\theta$ term of QCD violating charge and parity (CP) symmetries?

Old post, but I just heard of the following analogy recently so I thought I'd share. In the comments and elsewhere on this site, people have given a good answer about the mathematical answer to why ...
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### What is the advantage of using spherical tensor over cartesian tensor?

The Cartesian tensor is just $3\times 3=9$ values tied to an arbitrary coordinate system, and they get scrambled by rotations. While as you point out, spherical tensors are irreducible, and that means:...
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### What is the advantage of using spherical tensor over cartesian tensor?

The Coulomb potential is spherically symmetric. As a consequence, the wave functions of electrons orbiting a nucleus contain spherical harmonics. Therefore it is better to work in a spherical basis.
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