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About spin being an internal symmetry

  1. Mar 6, 2013 #1
    As we know, spin is an internal symmetry. but it seems a bit different from other internal symmetry, e.g. electrical charge, color, flavor... because it can be coupled with orbital angular momentum and in some aspects be linked to space-time. further more, we can classify all the particles into two families, bosons and fermions, which seems to make spin more important than any other internal symmetry.
    I am a bit confused of this, why is it special from others?
  2. jcsd
  3. Mar 6, 2013 #2


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    What do you mean by internal symmetry?
  4. Mar 6, 2013 #3


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    Spin is not an internal symmetry, but a space-time symmetry.
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