Nontrivial sound speed suppresses purity of the reduced density matrix, amplifies entropy and entanglement measures, and delays the onset of classicality in inflationary perturbations.
Inflation and squeezed quantum states.Physical Review D, 50(8):4807, 1994
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Quantum-information diagnostics of cosmological perturbations with nontrivial sound speed in inflation
Nontrivial sound speed suppresses purity of the reduced density matrix, amplifies entropy and entanglement measures, and delays the onset of classicality in inflationary perturbations.