On the Interaction in Lattice Gauge Theory

Published 10 Nov 2010 in hep-lat | (1011.2278v2)

Abstract: Haag's theorem states that if a quantum field theory is Lorentz invariant and irreducible, there is no interaction picture. But if we construct quantum field theory on a discrete lattice spacetime, its representation will be reducible and the interaction picture will be restored again.

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