For dynamically stable quadratic bosonic Hamiltonians, the Krein gap acts as the spectral gap; its closure at exceptional points or Krein collisions produces long-range correlations in the quasiparticle vacuum and is witnessed by entanglement entropy scaling.
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Quantum criticality beyond thermodynamic stability
For dynamically stable quadratic bosonic Hamiltonians, the Krein gap acts as the spectral gap; its closure at exceptional points or Krein collisions produces long-range correlations in the quasiparticle vacuum and is witnessed by entanglement entropy scaling.