A1 Journal article (refereed)
CMB spectral distortions in generic two-field models (2017)

Kainulainen, K., Leskinen, J., Nurmi, S., & Takahashi, T. (2017). CMB spectral distortions in generic two-field models. Journal of Cosmology and Astroparticle Physics, 2017(11), Article 002. https://doi.org/10.1088/1475-7516/2017/11/002

JYU authors or editors

Publication details

All authors or editors: Kainulainen, Kimmo; Leskinen, Juuso; Nurmi, Sami; Takahashi, Tomo

Journal or series: Journal of Cosmology and Astroparticle Physics

ISSN: 1475-7516

eISSN: 1475-7516

Publication year: 2017

Volume: 2017

Issue number: 11

Article number: 002

Publisher: IOP Publishing Ltd.

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1088/1475-7516/2017/11/002

Publication open access: Not open

Publication channel open access:

Publication is parallel published: https://arxiv.org/abs/1707.01300

Abstract

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 ηχ is constrained to the interval −0.007 < ηχ< 0.045.

Keywords: cosmic background radiation

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Related projects

Ministry reporting: Yes

Reporting Year: 2017

JUFO rating: 1