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referframe

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**Summary::**Looking for best literature or online courses on projective unitary representations of the Poincare Group.

I'm watching an online course on

**QFT. I understand that because this theory deals with both QM and SR, there is a need to represent Lorentz transformations with unitary equivalents. The course itself points out this requirement but does not really explain it in a rigorous way. My impression is that it is fairly complicated. I'm hoping to understand it without first getting my PhD in math. I'm looking for well-written literature or good online lectures on this subject.**

*relativistic*Thanks in advance.