Curvaton: Perturbations and reheating
نویسندگان
چکیده
منابع مشابه
Mixed inflaton and curvaton perturbations
A recent variant of the inflationary paradigm is that the “primordial” curvature perturbations come from quantum fluctuations of a scalar field, subdominant and effectively massless during inflation, called the “curvaton”, instead of the fluctuations of the inflaton field. We consider a cosmological scenario which mixes the standard and variant versions, i.e. where primordial curvature perturba...
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Primordial fluctuations in the relative number densities of particles, or isocurvature perturbations, are generally well constrained by cosmic microwave background (CMB) data. A less probed mode is the compensated isocurvature perturbation (CIP), a fluctuation in the relative number densities of cold dark matter and baryons. In the curvaton model, a sub-dominant field during inflation later set...
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The possible amplification of gauge invariant metric fluctuations in the infrared sector are very important during reheating stage of inflation. In this stage the inflaton field oscillates around the minimum of the scalar potential. The evolution for the super Hubble scales gauge invariant metric fluctuations can be studied by means of the Bardeen parameter. For a massive scalar field with pote...
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The behavior of scalar perturbations on superhorizon scales during the reheating stage is investigated by replacing the rapidly oscillating inflaton field by a perfect fluid obtained by spacetime averaging and the WKB approximation. The influence of the energy transfer from the inflaton to radiation on the evolution of the Bardeen parameter is examined for realistic reheating processes. It is s...
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ژورنال
عنوان ژورنال: Modern Physics Letters A
سال: 2020
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s0217732320502594