Thursday, 7 June 2018

group theory - Fundamental Representation of SU(3) is a complex representation


Let in a D(R) dimensional representation of SU(N) the generators, Tas follow the following commutation rule:
[TaR,TbR]=ifabcTcR.


Now if (TaR)=TaR, the representation R is real. Again if we can find a unitary matrix, V(I) such that


(TaR)=V1TaRVa


then the representation R is pseudoreal.


If a representation is neither real nor pseudoreal, the representation R is complex.


Claim: One way to show that a representation is complex is to show that at least one generator matrix TaR has eigenvalues that do not come in plus-minus pairs.


Now let us consider SU(3) group. The generators in the fundamental representation are given by


Ta=λa/2;a=1,...8,

where λas are the Gell-Mann matrices. We see that T8 has eigenvalues (1/12,1/12,1/3).


My doubt is:


According to the claim, is the fundamental representation of SU(3) a complex representation?




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