A numerical stochastic ΔN code reproduces the slow-roll power spectrum and shows that the time-independent non-perturbative spectrum fails at ultra-slow-roll transitions.
The Quantum State of Inflationary Perturbations
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abstract
This article reviews the properties of the quantum state of inflationary perturbations. After a brief description of the inflationary background, the wavefunction of the Mukhanov-Sasaki variable is calculated and shown to be that of a strongly squeezed state. The corresponding Wigner function and density matrix, which are convenient tools to characterize the properties of a quantum state, are also evaluated. Finally, the issue of definite outcomes for inflation is discussed.
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2024 1verdicts
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Stochastic inflation and non-perturbative power spectrum beyond slow roll
A numerical stochastic ΔN code reproduces the slow-roll power spectrum and shows that the time-independent non-perturbative spectrum fails at ultra-slow-roll transitions.