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Article Dans Une Revue JCAP Année : 2023

Dissipative Inflation via Scalar Production

Paolo Creminelli
  • Fonction : Auteur
Soubhik Kumar
  • Fonction : Auteur
Borna Salehian
  • Fonction : Auteur

Résumé

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 \textit{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: $f_{\rm NL}^{\rm eq} \gtrsim {O}(10)$.

Dates et versions

hal-04110347 , version 1 (30-05-2023)

Identifiants

Citer

Paolo Creminelli, Soubhik Kumar, Borna Salehian, Luca Santoni. Dissipative Inflation via Scalar Production. JCAP, 2023, 08, pp.076. ⟨10.1088/1475-7516/2023/08/076⟩. ⟨hal-04110347⟩
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