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Cold dark matter isocurvature perturbation in the curvaton scenario.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>2003
<mark>Journal</mark>Physical Review D – Particles and Fields
Issue number10
Pages (from-to)103516 / 11 pages
Publication StatusPublished
<mark>Original language</mark>English


We discuss the residual isocurvature perturbations, fully correlated with the curvature perturbation, that are automatic in the curvaton scenario if curvaton decay is sufficiently late. We contrast these residual isocurvature perturbations with the generally uncorrelated “intrinsic” isocurvature perturbation generated by an additional field such as the axion. We present a general formula for the residual isocurvature perturbations, referring only to the generation of the relevant quantity [cold dark matter (CDM), baryon number or lepton number] in an unperturbed universe. Specific formulas for the residual isocurvature CDM perturbation are given for most of the commonly considered CDM candidates.