Extra spin-2 in quadratic gravity is a dual inverted harmonic oscillator with vanishing Källén–Lehmann density, fixing a principal-value propagator and preserving unitarity with renormalizability.
Arrow of causality and quantum gravity
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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.
Ghosts lack asymptotic particle interpretation due to interference and different Riemann-sheet pole structures compared to decaying unstable particles, with finite-time effects producing narrower resonances and higher peaks.
citing papers explorer
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Unitary Quadratic Quantum Gravity in 4D
Extra spin-2 in quadratic gravity is a dual inverted harmonic oscillator with vanishing Källén–Lehmann density, fixing a principal-value propagator and preserving unitarity with renormalizability.
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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.
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Ghosts versus Unstable Particles in Quantum Field Theory
Ghosts lack asymptotic particle interpretation due to interference and different Riemann-sheet pole structures compared to decaying unstable particles, with finite-time effects producing narrower resonances and higher peaks.