Complex poles in the ghost propagator induce persistent interactions at asymptotic times, rendering negative-norm ghost states indistinguishable from superpositions of positive-norm multi-particle states and eliminating free asymptotic ghost particles.
Bound states of massive complex ghosts in superrenormalizable quantum gravity theories,
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Derives conditions under which energy remains positive for individual plane waves in six- and eight-derivative polynomial gravity, focusing on tensor and scalar sectors of the free theory.
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Asymptotic Quantum Dynamics of Ghost Fields
Complex poles in the ghost propagator induce persistent interactions at asymptotic times, rendering negative-norm ghost states indistinguishable from superpositions of positive-norm multi-particle states and eliminating free asymptotic ghost particles.