2017/07/31 by Kimmo Kainulainen, Juuso Leskinen, Sami Nurmi +1 · 10 citations
Earth and Planetary Sciences · Physics and Astronomy · #Amplitude #Black Holes and Theoretical Physics #Cosmic background radiation #Cosmic microwave background #Cosmology and Gravitation Theories #Distortion (music) #Field (mathematics) #Geophysics and Gravity Measurements #Inflation (cosmology) #Inflaton #Mathematical physics #Non-Gaussianity #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Sensitivity (control systems) #Statistical physics #Theoretical physics #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2017/11/002
published in Journal of Cosmology and Astroparticle Physics 2017(11), 002 (Institute of Physics) · 15 pages, 6 figures. v2: published version, minor changes
openalex publication_date 2017/11/06 · arxiv created 2017/11/08 · arxiv updated 2017/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We investigate the CMB μ distortion in models where two uncorrelated sources contribute to primordial perturbations. We parameterise each source by an amplitude, tilt, running and running of the running. We perform a detailed analysis of the distribution signal as function of the model parameters, highlighting the differences compared to single-source models. As a specific example, we also investigate the mixed inflaton-curvaton scenario. We find that the μ distortion could efficiently break degeneracies of curvaton parameters especially when combined with future sensitivity of probing the tensor-to-scalar ratio r . For example, assuming bounds μ < 0.5 × 10 −8 and r <0.01, the curvaton contribution should either vanish or the curvaton should dominate primordial perturbations and its slow-roll parameter η χ is constrained to the interval −0.007 < η χ < 0.045.