I am reading texts on QFT and they place a lot of emphasis on finding irreducible representations of the Lorentz/Poincare Group. I also recall some level of discussion from non-relativistic quantum mechanics, and I've also read up a bit on them in texts on representation theory. I am wondering however why they are particularly significant to physicists. If anyone could clarify this for me it would be greatly appreciated.

  • $\begingroup$ Is the question about the theory of representation, or about the irreducible representation of group theory ? $\endgroup$
    – FraSchelle
    Nov 29, 2017 at 9:45
  • $\begingroup$ An irreducible representation indicates that the quantum system is elementary; please see the following question: physics.stackexchange.com/questions/73593/… $\endgroup$ Dec 3, 2017 at 15:21


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