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)∗=V−1TaRV∀a
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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