Forecasting the curvaton isocurvature scenario with CMB lensing information

Abstract

Some inflationary models predict the existence of isocurvature primordial fluctuations, in addition to the well known adiabatic perturbations. Such mixed models are not yet ruled out by available data sets. The talk presented at the Young Research Meeting covered the possibility of obtaining better constraints on the isocurvature contribution from future astronomical data. I use Planck satellite experimental specifications together with SDSS galaxy survey to forecast for the best parameter error estimate by means of the Fisher information matrix formalism. In particular, I consider how CMB lensing information can improve this forecast. I focus specially in the curvaton inflationary scenario to show a substantial improvement in all the considered cosmological parameters. In the case of isocurvature amplitude the improvement is above 20% around its fiducial value. In this sense, CMB lensing information will be crucial in the analysis of future data.