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Toyokazu Sekiguchi
순수물리이론 연구단
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Mixed inflaton and spectator field models: CMB constraints and μ distortion

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Title
Mixed inflaton and spectator field models: CMB constraints and μ distortion
Author(s)
Kari Enqvist; Toyokazu Sekiguchi; Tomo Takahashi
Publication Date
2016-04
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2016, no.4, pp.057 -
Publisher
IOP PUBLISHING LTD
Abstract
We discuss mixed inflaton and spectator field models where both the fields are responsible for the observed density fluctuations. We combine the angular power spectrum of the CMB temperature anisotropy from the Planck 2013 result and other ground-based CMB observations in order to constrain both the general mixed model as well as some specific representative scenarios. Based on the Markov Chain Monte Carlo method, in addition to constraints on model parameters, we obtain the predictive posterior distributions of the CMB spectralµdistortion for those models. We demonstrate that the standard single-field inflaton model typically predictsµ∼10−8with a relatively narrow distribution, whereas for the mixed models, the distribution turns out to be much broader, andµcould be larger by almost an order of magnitude. Hence future experiments ofµdistortion could provide a tool for the critical testing of the mixed source models of the primordial perturbation. (c) 2016 IOP Publishing Ltd and Sissa Medialab srl
URI
https://pr.ibs.re.kr/handle/8788114/3304
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > Journal Papers (저널논문)
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