Primordial black holes from the ultraslow-roll phase in the inflaton--curvaton mixed field inflation
arXiv:2502.14323 · doi:10.1140/epjc/s10052-025-13921-8
Abstract
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 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 that account for all dark matter, while remaining consistent with current observational constraints.
11 pages, 4 figures
References in corpus (31)
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- Primordial Black Holes as Dark Matter: Recent Developments
- Primordial Black Holes as a dark matter candidate
- Primordial black hole dark matter from single field inflation
- Primordial Black Holes and Slow-Roll Violation
- INTEGRAL constraints on primordial black holes and particle dark matter
- PBHs and secondary GWs from ultra slow roll and punctuated inflation
- Ultra slow-roll inflation demystified
- Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion
- Primordial non-gaussianity up to all orders: theoretical aspects and implications for primordial black hole models
- A numerical study of non-gaussianity in the curvaton scenario
- Non-Gaussian tail of the curvature perturbation in stochastic ultra-slow-roll inflation: implications for primordial black hole production
- Implications of stochastic effects for primordial black hole production in ultra-slow-roll inflation
- An analytical approximation of the scalar spectrum in the ultra-slow-roll inflationary models
- Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
- Large Non-Gaussianity Implication for Curvaton Scenario
- Power spectrum of primordial perturbations during ultra-slow-roll inflation with back reaction effects
- Isocurvature, non-gaussianity and the curvaton model
- Primordial Black Hole Formation in Non-Minimal Curvaton Scenario
- Stochastic constant-roll inflation and primordial black holes
- Observational imprints of enhanced scalar power on small scales in ultra slow roll inflation and associated non-Gaussianities
- Planck Constraints and Gravitational Wave Forecasts for Primordial Black Hole Dark Matter Seeded by Multifield Inflation
- Primordial Black Hole Dark Matter evaporating on the Neutrino Floor
- Production of Primordial Black Holes via Single Field Inflation and Observational Constraints
- Multiple Field Ultra Slow Roll Inflation: Primordial Black Holes From Straight Bulk And Distorted Boundary
- Window function dependence of the novel mass function of primordial black holes
- Primordial black holes and scalar-induced gravitational waves from the perturbations on the inflaton potential in peak theory
- Constraints on ultra-slow-roll inflation from the third LIGO-Virgo observing run
- Sudden braking and turning with a two-field potential bump: primordial black hole formation
- Embedding Ultra slow-roll inflaton dynamics in Warm Inflation
- An analytical approximation of the evolution of the primordial curvature perturbation in the ultraslow-roll inflation