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Charge Conjugation and Internal Symmetry Representations 
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#1
Feb1212, 08:25 PM

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Hi All,
I am trying to work through a QFT problem for independent study and I can't quite get my head around it. It is 5.16 from Tom Bank's book (http://www.nucleares.unam.mx/~alberto/apuntes/banks.pdf) which goes as follows: "Show that charge conjugation symmetry implies that the representation of the internal symmetry group G is real or pseudoreal." (I think we only need to deal with scalar fields here but I don't know that it matters.) The book linked to above has more details on pages 5052. I am am pretty confused but I think that I need to show that the representation [itex]R_S[/itex] is not complex if Csymmetry exists. That is to show that [itex]R_s^\dagger=U^\dagger R_s U[/itex]. (i.e. unitary equivalence) is implied by Csymmetry on scalar fields. Thanks in advance for any help. Eric 


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