Correlated isocurvature perturbations from mixed inflaton–curvaton decay

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http://hdl.handle.net/10138/310234

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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 . https://doi.org/10.1088/1475-7516/2004/10/010

Title: Correlated isocurvature perturbations from mixed inflaton–curvaton decay
Author: Ferrer, Francesc; Räsänen, Syksy; Väliviita, Jussi
Contributor: University of Helsinki, University of Oxford
University of Helsinki, Particle Physics and Astrophysics
Date: 2004-10-15
Language: eng
Number of pages: 1
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/310234
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.
Subject: 114 Physical sciences
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