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• W2009235916 abstract "We consider the possibility that the primordial curvature perturbation was generated through the curvaton mechanism from a scalar field with an electric charge, or precisely the Standard Model U(1) weak hypercharge. This links the dynamics of the very early universe concretely to the Standard Model of particle physics, and because the coupling strength is known, it reduces the number of free parameters in the curvaton model. The gauge coupling also introduces several new physical effects. Charge fluctuations are generated during inflation, but they are screened by electron-positron pairs therefore do not violate observational constraints. After inflation, the curvaton interacts with thermal radiation which destroys the curvaton condensate and prevents the generation of curvature perturbations, unless the inflaton dynamics satisfy strong constraints. The curvaton also experiences a period of parametric resonance with the U(1) gauge field. Using the standard perturbative approach, we find that the model can generate the observed density perturbation for Hubble rate H*≳108GeV and curvaton mass m≳10−2H*, but with a level of non-Gaussianity (fNL≳130) that violates observational constraints. However, previous studies have shown that the parametric resonance changes the predicted perturbations significantly, and therefore fully non-linear numerical field theory simulations are required." @default.
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• W2009235916 date "2012-10-02" @default.
• W2009235916 modified "2023-10-18" @default.
• W2009235916 title "Electrically charged curvaton" @default.
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• W2009235916 doi "https://doi.org/10.1088/1475-7516/2012/10/004" @default.
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