Spectator-field backreaction during slow-roll inflation changes the inflaton by a factor e^{Υ N_e²}, not the e^{Γ N_e} a local friction term would give.
Gravitational Waves from Isocurvature Perturbations of Spectator Scalar Fields
3 Pith papers cite this work. Polarity classification is still indexing.
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A spectator scalar field with strong portal coupling to the inflaton sources a stochastic gravitational wave background reaching Ω_GW h² ∼ 10^{-11} at frequencies 10^7-10^8 Hz for benchmark parameters σ/λ ≃ 10^4 and T_reh = 2×10^{14} GeV.
Combined CMB datasets moderately tighten the allowed range for the spectral index of axion isocurvature but leave amplitude bounds for fixed indices unchanged.
citing papers explorer
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What spectators do during inflation
Spectator-field backreaction during slow-roll inflation changes the inflaton by a factor e^{Υ N_e²}, not the e^{Γ N_e} a local friction term would give.
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Gravitational Waves from Matter Perturbations of Spectator Scalar Fields
A spectator scalar field with strong portal coupling to the inflaton sources a stochastic gravitational wave background reaching Ω_GW h² ∼ 10^{-11} at frequencies 10^7-10^8 Hz for benchmark parameters σ/λ ≃ 10^4 and T_reh = 2×10^{14} GeV.
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CMB Constraints on Pre-Inflationary Axion Dark Matter Isocurvature
Combined CMB datasets moderately tighten the allowed range for the spectral index of axion isocurvature but leave amplitude bounds for fixed indices unchanged.