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It is shown from spectral representations involving the energy-momentum tensor that in general a field theory quantized on the light cone (as opposed to the case in which an equal-time-quantized theory is merely rewritten in terms of light-cone coordinates) does not possess a Lorentz-invariant vacuum state. The sole exception to this result occurs in cases for which one has scale invariance.
Physical Review D – American Physical Society (APS)
Published: Nov 15, 1981
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