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Ghosts versus Unstable Particles in Quantum Field Theory
general-relativity-and-quantum-cosmologyhigh-energy-physics-phenomenologyhigh-energy-physics-theoryquantum-physics
We elucidate the physical nature of ghosts above the multi-particle threshold by contrasting them with unstable particles in quantum field theory. We first consider the asymptotic formulation, where ordinary positive-norm one-particle states can be unstable and decay, whereas ghosts survive asymptot
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