"Can an article having spin be seen as spinless in a properly choosen frame of reference? Lets take two-atomic molecule that has spin while the both atoms have zero spin. Can we choose a frame of reference where this molecule has no spin?"

stratsticks57jl 2022-07-19 Answered
Can an article having spin be seen as spinless in a properly choosen frame of reference?
Lets take two-atomic molecule that has spin while the both atoms have zero spin. Can we choose a frame of reference where this molecule has no spin?
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Answers (1)

constanzma
Answered 2022-07-20 Author has 8 answers
Spin is precisely the number that tells you in which representation of the rotation group S O ( 3 ) (non-relativistic) or Lorentz group S O ( 1 , 3 ) (relativistic) a quantum state transforms. As these groups are precisely the transformations between reference frames (aside from the boring translations), spin is an invariant under change of reference frame.

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