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• W1525901810 abstract "We demonstrate novel features in the behavior of the second- and third-order nonlinearity parameters of the curvature perturbation, namely ${f}_{mathrm{NL}}$ and ${g}_{mathrm{NL}}$, arising from nonlinear motion of the curvaton field. We investigate two classes of potentials for the curvaton---the first has tiny oscillations superimposed upon the quadratic potential. The second is characterized by a single ``feature'' separating two quadratic regimes with different mass scales. The feature may either be a bump or a flattening of the potential. In the case of the oscillatory potential, we find that, as the width and height of superimposed oscillations increase, both ${f}_{mathrm{NL}}$ and ${g}_{mathrm{NL}}$ deviate strongly from their expected values from a quadratic potential. ${f}_{mathrm{NL}}$ changes sign from positive to negative as the oscillations in the potential become more prominent. Hence, this model can be severely constrained by convincing evidence from observations that ${f}_{mathrm{NL}}$ is positive. ${g}_{mathrm{NL}}$, on the other hand, acquires very large negative values. Further, this model can give rise to a large running of ${f}_{mathrm{NL}}$, with respect to scale. For the single-feature potential, we find that ${f}_{mathrm{NL}}$ and ${g}_{mathrm{NL}}$ exhibit oscillatory behavior as a function of the parameter that controls the feature. The running of ${f}_{mathrm{NL}}$ with respect to scale is found to be small." @default.
• W1525901810 created "2016-06-24" @default.
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• W1525901810 date "2011-01-27" @default.
• W1525901810 modified "2023-10-15" @default.
• W1525901810 title "New features in the curvaton model" @default.
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• W1525901810 doi "https://doi.org/10.1103/physrevd.83.023527" @default.
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