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seen Jun 17 at 16:03

Jun
2
awarded  Yearling
May
17
comment Spin, orbital angular momentum and total angular momentum
John - What is Gouldsmit talking about? The electron "rotates?" For starters, I've heard it is a "point particle" which doesn't even a radius we can measure?
May
16
comment Spin, orbital angular momentum and total angular momentum
ACuriousMind - so where is the starting point then? Should we start from rotational invariance, and from that both orbital angular momentum and spin emerge via an irreducible representation of the Lorentz group? (spin being one of the spaces in the direct sum decomposition of a tensor product of spaces (I recently learned how to do that! :-))
May
16
asked Spin, orbital angular momentum and total angular momentum
May
10
accepted How to use Clebsch-Gordan coefficients for 3 particles?
May
10
accepted Calculations with angular momentum
May
10
comment How to use Clebsch-Gordan coefficients for 3 particles?
Thanks - yes, I realized that, I can get energies and degeneracies just with the sum decomposition. Very neat!
May
10
comment Calculations with angular momentum
ACuriousMind - please bear with me, as (as you know :-), I'm just a student in a QM class... I am not sure I understand your point: I thought I would just try my hand at this kind of computation with a system of 2 particles of spin 1 and 1 particle of spin 1/2. Is that somehow illegal?
May
10
asked Calculations with angular momentum
May
10
comment How to use Clebsch-Gordan coefficients for 3 particles?
Thanks Alexander! So in the case of 3 spins, I need to use the CG coefficients twice, for adding 2 spins, then again to add them to the third spin?
May
10
revised How to use Clebsch-Gordan coefficients for 3 particles?
edited tags
May
10
revised How to use Clebsch-Gordan coefficients for 3 particles?
deleted 4 characters in body
May
10
revised How to use Clebsch-Gordan coefficients for 3 particles?
Added details to the question.
May
10
revised How to use Clebsch-Gordan coefficients for 3 particles?
deleted 1 character in body
May
10
asked How to use Clebsch-Gordan coefficients for 3 particles?
May
8
accepted 3D isotropic oscillator and angular momentum algebra
May
7
asked 3D isotropic oscillator and angular momentum algebra
May
7
accepted Correct vector space of eigenkets of angular momentum
May
7
comment Correct vector space of eigenkets of angular momentum
Except, that if you go to high in energy, there won't be any bound state anymore - so the sum is not really infinite in practice :-) Thanks ACuriousMind, that's precisely the answer I was looking for.
May
6
comment Correct vector space of eigenkets of angular momentum
pindakaas - thanks - I'm just learning QM, and angular momentum turns out to be very hard for me. No doubt am I making errors :-) I should probably edit the title. What would you suggest?