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Primordial black holes from the ultraslow-roll phase in the inflaton–curvaton mixed field inflation
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Primordial black holes from the ultraslow-roll phase in the inflaton–curvaton mixed field inflation
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Journal Article
Primordial black holes from the ultraslow-roll phase in the inflaton–curvaton mixed field inflation
2025
Overview
Primordial black holes (PBHs) are a promising candidate for dark matter, as they can form in the very early universe without invoking new particle physics. This work explores PBH formation within a curvaton scenario featuring an ultraslow-roll (USR) phase. An inflaton–curvaton mixed field model is presented, where the inflaton drives early inflation and then transits into the USR phase, amplifying the small-scale curvature perturbation. During inflation, the curvaton generates entropy perturbation, which later converts into curvature perturbation after the curvaton decays in the radiation-dominated era. Using the
δ
N
formalism, we compute the power spectrum of the total primordial curvature perturbation and analyze the relevant non-Gaussianity. Our results show that adding a curvaton field not only has a significant impact on primordial non-Gaussianity, but also introduces more complex inflationary dynamics, even saving the inflaton potentials that generate too low scalar spectral indices. Our model can produce PBHs with mass around
10
-
14
M
⊙
that account for all dark matter, while remaining consistent with current observational constraints.
Publisher
Springer Berlin Heidelberg,Springer,Springer Nature B.V,SpringerOpen
