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Primordial non-gaussianity from multiple curvaton decay
Jussi Valiviita, Hooshyar Assadullahi, David Wands
We study a model where two scalar fields, that are subdominant during inflation, decay into radiation some time after inflation has ended but before primordial nucleosynthesis. Per…
Non-Gaussianity and constraints for the variance of perturbations in the curvaton model
Jussi Valiviita, Misao Sasaki, David Wands
Recently, the primordial non-Gaussianity in the curvaton model has been predicted assuming sudden decay of the curvaton. We extend the calculation to non-instantaneous decay by emp…
Correlated Primordial Perturbations in Light of CMB and LSS Data
Hannu Kurki-Suonio, Vesa Muhonen, Jussi Valiviita
We use cosmic microwave background (CMB) and large-scale structure data to constrain cosmological models where the primordial perturbations have both an adiabatic and a cold dark m…
Correlated isocurvature perturbations from mixed inflaton-curvaton decay
Francesc Ferrer, Syksy Rasanen, Jussi Valiviita
We study cosmological perturbations in the case that present-day matter consists of a mixture of inflaton and curvaton decay products. We calculate how the curvaton perturbations a…
Correlated adiabatic and isocurvature CMB fluctuations in the light of the WMAP data
Jussi Valiviita
In multi-field inflation models, correlated adiabatic and isocurvature fluctuations are produced and in addition to the usual adiabatic fluctuation with a spectral index n_ad1 ther…