Planck Constraints and Gravitational Wave Forecasts for Primordial Black Hole Dark Matter Seeded by Multifield Inflation

Abstract

We perform a Markov Chain Monte Carlo (MCMC) analysis of a simple yet generic multifield inflation model characterized by two scalar fields coupled to each other and nonminimally coupled to gravity, fit to Planck 2018 cosmic microwave background (CMB) data. In particular, model parameters are constrained by data on the amplitude of the primordial power spectrum of scalar curvature perturbations on CMB scales $A_s$, the spectral index $n_s$, and the ratio of power in tensor to scalar modes $r$, with a prior that the primordial power spectrum should also lead to primordial black hole (PBH) production sufficient to account for the observed dark matter (DM) abundance. We find that $n_s$ in particular controls the constraints on our model. Whereas previous studies of PBH formation from an ultra-slow-roll phase of inflation have highlighted the need for at least one model parameter to be highly fine-tuned, we identify a degeneracy direction in parameter space such that shifts by $\sim 10\%$ of one parameter can be compensated by comparable shifts in other parameters while preserving a close fit between model predictions and observations. Furthermore, we find this allowed parameter region produces observable gravitational wave (GW) signals in the frequency ranges to which upcoming experiments are projected to be sensitive, including Advanced LIGO and Virgo, the Einstein Telescope (ET), Cosmic Explorer (CE), DECIGO, and LISA.

27 pages, 10 figures, 2 tables. Minor edits and references added to match published version (forthcoming in Physical Review D), including an additional appendix to discuss effects on the power spectrum from a phase of ultra-slow-roll evolution

References in corpus (22)

• The Standard Model Higgs boson as the inflaton
• 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
• Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
• The cosmological gravitational wave background from primordial density perturbations
• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• The Unity of Cosmological Attractors
• Primordial black hole dark matter from single field inflation
• Primordial Black Holes and Slow-Roll Violation
• The Threshold for Primordial Black Hole Formation: a Simple Analytic Prescription
• Perturbations in generalized multi-field inflation
• Conformal Transformations with Multiple Scalar Fields
• Primordial Bispectrum from Multifield Inflation with Nonminimal Couplings
• Constraints on the induced gravitational wave background from primordial black holes
• Violent Preheating in Inflation with Nonminimal Coupling
• Preheating in Palatini Higgs inflation
• Review of the Advanced LIGO gravitational wave observatories leading to observing run four
• Multifield Dynamics of Higgs Inflation
• Power spectrum in stochastic inflation
• Inflation from Nilpotent Kähler Corrections
• A New Measure of Fine Tuning
• Time-Scales for Nonlinear Processes in Preheating after Multifield Inflation with Nonminimal Couplings

Cited by in corpus (26)

• Quantum loop effects on the power spectrum and constraints on primordial black holes
• Galileon inflation evades the no-go for PBH formation in the single-field framework
• Primordial black holes from single-field inflation: a fine-tuning audit
• Primordial black holes as dark matter: Interferometric tests of phase transition origin
• Primordial perturbations from ultra-slow-roll single-field inflation with quantum loop effects
• Inflation, the Hubble Tension and Early Dark Energy: an alternative overview
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Enhanced Curvature Perturbation and Primordial Black Hole Formation in Two-stage Inflation with a break
• Large fluctuations and Primordial Black Holes
• Ultra-High-Energy Neutrinos from Primordial Black Holes
• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
• Slaying Axion-Like Particles via Gravitational Waves and Primordial Black Holes from Supercooled Phase Transition
• Magnetogenesis with gravitational waves and primordial black hole dark matter
• Tracking the Multifield Dynamics with Cosmological Data: A Monte Carlo approach
• Inflationary attractors and radiative corrections in light of ACT data
• Gravity-improved metastability bounds for the Type-I Seesaw Mechanism
• Black holes and gravitational waves from phase transitions in realistic models
• Untangling PBH overproduction in $w$-SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
• Constraining the impact of standard model phase transitions on primordial black holes
• Constraining ultra slow roll inflation using cosmological datasets
• Exploring primordial black holes and gravitational waves with R-symmetric GUT Higgs inflation
• Gravitational wave signals from primordial black holes orbiting solar-type stars
• Primordial black holes from the ultraslow-roll phase in the inflaton--curvaton mixed field inflation
• Hawking Radiation Signatures from Primordial Black Holes Transiting the Inner Solar System: Prospects for Detection
• Elastic Scattering of Cosmological Gravitational Wave Backgrounds: Primordial Black Holes and Stellar Objects
• Separate universe in multifield inflation: a phase-space approach