Mixed Inflaton and Spectator Field Models: CMB constraints and $\mu$ distortion

Abstract

We discuss mixed inflaton and spectator field models where both the fields are responsible for the observed density fluctuations. We use the current CMB data to constrain both the general mixed model as well as some specific representative scenarios, and collate the results with the model predictions for the CMB spectral $\mu$ distortion. We find the posterior distribution of $\mu$ using MCMC chains and demonstrate that the standard single-field inflaton model typically predicts $\mu \sim 10^{-8}$ with a relatively narrow distribution, whereas for the mixed models, the distribution turns out to be much broader, and $\mu$ could be larger by almost an order of magnitude. Hence future experiments of $\mu$ distortion could provide a tool for the critical testing of the mixed source models of the primordial perturbation.

18 pages, 8 figures

References in corpus (10)

• A Joint Analysis of BICEP2/Keck Array and Planck Data
• Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
• Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
• Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion
• Beyond y and μ: the shape of the CMB spectral distortions in the intermediate epoch, 1.5x10^4 < z < 2x10^5
• On Classification of Models of Large Local-Type Non-Gaussianity
• Spectral distortions from the dissipation of tensor perturbations
• CMB $\mu$ distortion from primordial gravitational waves
• Resolving primordial physics through correlated signatures
• The Superhorizon Test of Future B-mode Experiments

Cited by in corpus (1)

• Running the running