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Non-abelian gauge symmetry

  1. Aug 26, 2004 #1
    How does a non-abelian gauge symmetry lead to
    asymptotic freedom for quarks?
     
  2. jcsd
  3. Aug 26, 2004 #2
    In a non-Abelian gauge theory, the gauge fields also carry the charge. (I'm sure you've been told before that gluons carry color). The self-interaction of the gauge fields is non-trivial, but in the case of QCD they cause a decrease in the coupling constant with increasing energy. In fact, the actual behavior depends on the number of colors and flavors - more colors favor decreasing coupling and more flavors favor increasing coupling. With 3 colors and 6 flavors, the result is decreasing.
     
  4. Aug 26, 2004 #3
    In what respect is the colour field non-commutative?
     
  5. Aug 26, 2004 #4
    The gauge group is SU(3) which is non-abelian. The gauge group of QED is simply the unit circle U(1) which is abelian (the phases add in the unit cirlce).
     
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