CMB spectral distortions in generic two-field models

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dc.contributor.author Kainulainen, Kimmo
dc.contributor.author Leskinen, Juuso
dc.contributor.author Nurmi, Sami
dc.contributor.author Takahashi, Tomo
dc.date.accessioned 2019-11-28T13:19:02Z
dc.date.available 2019-11-28T13:19:02Z
dc.date.issued 2017-11
dc.identifier.citation 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
dc.identifier.other PURE: 94152522
dc.identifier.other PURE UUID: bde6d9d9-69d7-490d-8bf2-8c249fe3de96
dc.identifier.other WOS: 000414557000002
dc.identifier.other Scopus: 85039415445
dc.identifier.uri http://hdl.handle.net/10138/307619
dc.description.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. en
dc.format.extent 16
dc.language.iso eng
dc.relation.ispartof Journal of Cosmology and Astroparticle Physics
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject cosmological parameters from CMBR
dc.subject inflation
dc.subject physics of the early universe
dc.subject ART. NO. 023505
dc.subject CURVATURE PERTURBATION
dc.subject DENSITY PERTURBATIONS
dc.subject ENERGY-RELEASE
dc.subject MIXED INFLATON
dc.subject EARLY UNIVERSE
dc.subject CONSTRAINTS
dc.subject GENERATION
dc.subject RADIATION
dc.subject COSMOLOGY
dc.subject 115 Astronomy, Space science
dc.subject 114 Physical sciences
dc.title CMB spectral distortions in generic two-field models en
dc.type Article
dc.contributor.organization Helsinki Institute of Physics
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1088/1475-7516/2017/11/002
dc.relation.issn 1475-7516
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

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