CMB spectral distortions in generic two-field models

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http://hdl.handle.net/10138/307619

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Kainulainen , K , Leskinen , J , Nurmi , S & Takahashi , T 2017 , ' CMB spectral distortions in generic two-field models ' , Journal of Cosmology and Astroparticle Physics , vol. 2017 , no. 11 , 002 . https://doi.org/10.1088/1475-7516/2017/11/002

Title: CMB spectral distortions in generic two-field models
Author: Kainulainen, Kimmo; Leskinen, Juuso; Nurmi, Sami; Takahashi, Tomo
Other contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics

Date: 2017-11
Language: eng
Number of pages: 16
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
DOI: https://doi.org/10.1088/1475-7516/2017/11/002
URI: http://hdl.handle.net/10138/307619
Abstract: We investigate the CMB mu 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 mu 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 mu <0.5 x 10(-8) and r <0.01, the curvaton contribution should either vanish or the curvaton should dominate primordial perturbations and its slow-roll parameter eta(chi) is constrained to the interval -0.007 <eta(chi) <0.045.
Subject: cosmological parameters from CMBR
inflation
physics of the early universe
ART. NO. 023505
CURVATURE PERTURBATION
DENSITY PERTURBATIONS
ENERGY-RELEASE
MIXED INFLATON
EARLY UNIVERSE
CONSTRAINTS
GENERATION
RADIATION
COSMOLOGY
115 Astronomy, Space science
114 Physical sciences
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