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Wigner's classification: "The identification of particle species with irreducible unitary representations of the symmetry group acting on matter fields over spacetime."

this sounds interesting ngl

· · Moa · 1 · 0 · 0

"Physically, one is interested in irreducible projective unitary representations of the Poincaré group. After all, two vectors in the quantum Hilbert space that differ by multiplication by a constant represent the same physical state"

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