Abstract
We describe a new mechanism that gives rise to dissipation during cosmic inflation.In the simplest implementation, the mechanism requires the presence of a massive scalar field with a softly-broken global U(1) symmetry, along with the inflaton field.Particle production in this scenario takes place on parametrically sub-horizon scales, at variance with the case of dissipation into gauge fields.Consequently, the backreaction of the produced particles on the inflationary dynamics can be treated in a local manner, allowing us to compute their effects analytically.We determine the parametric dependence of the power spectrum which deviates from the usual slow-roll expression.Non-Gaussianities are always sizeable whenever perturbations are generated by the noise induced by dissipation: f NL eq ≳ O(10).
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