Correlated isocurvature perturbations from mixed inflaton–curvaton decay

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dc.contributor University of Helsinki, University of Oxford en
dc.contributor University of Helsinki, Particle Physics and Astrophysics en Ferrer, Francesc Räsänen, Syksy Väliviita, Jussi 2020-01-23T11:20:01Z 2020-01-23T11:20:01Z 2004-10-15
dc.identifier.citation Ferrer , F , Räsänen , S & Väliviita , J 2004 , ' Correlated isocurvature perturbations from mixed inflaton–curvaton decay ' , Journal of Cosmology and Astroparticle Physics , vol. 2004 , no. 10 , pp. 10 . en
dc.identifier.issn 1475-7516
dc.identifier.other PURE: 130559257
dc.identifier.other PURE UUID: 0f8e1580-9e64-4127-b46c-3ca6397409c7
dc.identifier.other RIS: urn:81D59035CE6A71F72887AB7F104C9268
dc.identifier.other ORCID: /0000-0003-2296-302X/work/68615176
dc.identifier.other ORCID: /0000-0001-6225-3693/work/68616395
dc.description.abstract We study cosmological perturbations in the case in which present-day matter consists of a mixture of inflaton and curvaton decay products. We calculate how the curvaton perturbations are transferred to its decay products in the general case when it does not behave like dust. Taking into account that the decay products of the inflaton can also have perturbations results in an interesting mixture of correlated adiabatic and isocurvature perturbations. In particular, negative correlation can improve the fit to the CMB data by lowering the angular power in the Sachs–Wolfe plateau without changing the peak structure. We do an 11-parameter fit to the WMAP data. We find that the best fit is not the ‘concordance model’, and that well-fitting models do not cluster around the best fit, so cosmological parameters cannot be reliably estimated. We also find that in our model the mean quadrupole (l = 2) power is l(l+1)Cl/2π = 1081 μK2, much lower than in the pure adiabatic ΛCDM model, which gives 1262 μK2. en
dc.format.extent 1
dc.language.iso eng
dc.relation.ispartof Journal of Cosmology and Astroparticle Physics
dc.rights en
dc.subject 114 Physical sciences en
dc.title Correlated isocurvature perturbations from mixed inflaton–curvaton decay en
dc.type Article
dc.description.version Peer reviewed
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/acceptedVersion

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