Space-Time Symmetries and the Spontaneous Breakdown of Dilation Invariance

Abstract
The assumption that the Poincaré generators are the space integrals of local conserved currents is used to derive restrictions on the spectral function of certain vacuum expectation values. Then an argument is given that these restrictions and the vanishing of the trace of the stress-energy tensor (conservation of dilation current) imply that all single-particle states have zero mass, even when the conservation of the current is implemented by a Goldstone boson.

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