Abstract
We study cosmological perturbations in the case in which present-day matter consists of amixture of inflaton and curvaton decay products. We calculate how the curvatonperturbations are transferred to its decay products in the general case when itdoes not behave like dust. Taking into account that the decay products of theinflaton can also have perturbations results in an interesting mixture of correlatedadiabatic and isocurvature perturbations. In particular, negative correlation canimprove the fit to the CMB data by lowering the angular power in the Sachs–Wolfeplateau without changing the peak structure. We do an 11-parameter fit to theWMAP data. We find that the best fit is not the ‘concordance model’, and thatwell-fitting models do not cluster around the best fit, so cosmological parameterscannot be reliably estimated. We also find that in our model the mean quadrupole(l = 2) power isl(l+1)Cl/2π = 1081 μK2, much lower than inthe pure adiabatic ΛCDM model, which gives 1262 μK2.
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