Non-Gaussianity in three fluid curvaton model

Abstract

The generation of non-gaussianity is studied in a three fluid curvaton model. By utilizing second order perturbation theory we derive general formulae for the large scale temperature fluctuation and non-gaussianity parameter, $f_{NL}$, that includes the possibility of a non-adiabatic final state. In the adiabatic limit we recover previously known results. The results are applied to a three fluid curvaton model where the curvaton decays into radiation and matter. We find that the amount of non-gaussianity decreases as the final state of the system becomes more adiabatic and that the generated non-gaussianity in the scenario is small, $|f_{NL}|\sim \mathcal{O}(1)$.

10 pages, 2 figures

References in corpus (7)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Large Non-Gaussianity Implication for Curvaton Scenario
• Correlated isocurvature perturbations from mixed inflaton-curvaton decay
• Primordial non-Gaussianity from two curvaton decays
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• The Maximal Amount of Gravitational Waves in the Curvaton Scenario
• Neutralino Dark Matter and the Curvaton

Cited by in corpus (5)

• Primordial Non-Gaussianities of General Multiple Field Inflation
• Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
• N-vaton
• Spectral Index in Curvaton Scenario
• Primordial non-gaussianity from multiple curvaton decay