A Mass-Splitting Theorem for General Definitions of Mass

Abstract
Some previous theorems on mass splitting are considered for the case in which there is no mass gap. It is shown that, for a very wide class of definitions of particle masses, including their definitions as eigenvalues (isolated or nonisolated) of the mass operator, any Lie group containing the Poincaré group cannot contain a conventional semisimple spectrum-generating group such as SU(3) or SL(3, C).

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