Production of primordial black holes in improved E-models of inflation

Abstract

The E-type $\alpha$-attractor models of single-field inflation were generalized further in order to accommodate production of primordial black holes (PBH) via adding a near-inflection point to the inflaton scalar potential at smaller scales, in good agreement with measurements of the cosmic microwave background (CMB) radiation. A minimal number of new parameters was used but their fine-tuning was maximized in order to increase possible masses of PBH formed during an ultra-slow-roll phase leading to a large enhancement of the power spectrum of scalar (curvature) perturbations by 6 or 7 orders of magnitude against the power spectrum of perturbations observed in CMB. It was found that extreme fine-tuning of the parameters in our models can lead to a formation of Moon-size PBH with the masses of approximately $10^{26}$ g, still in agreement with CMB observations. Quantum corrections are known to lead to the perturbative upper bound on the amplitude of large scalar perturbations responsible for PBH production. The quantum (one-loop) corrections in our models were found to be suppressed by one order of magnitude for PBH with the masses of approximately $10^{19}$ g, which may form the whole dark matter in the Universe.

12 pages, 7 figures, LaTeX; title revised

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Cited by in corpus (10)

• The recent gravitational wave observation by pulsar timing arrays and primordial black holes: the importance of non-gaussianities
• One loop to rule them all: Perturbativity in the presence of ultra slow-roll dynamics
• Curbing PBHs with PTAs
• Constraints on primordial black holes from LIGO-Virgo-KAGRA O3 events
• Are single-field models of inflation and PBHs production ruled out by ACT observations?
• Resonant amplification of curvature perturbations in inflation model with periodical derivative coupling
• One-loop corrections to the E-type $\alpha$-attractor models of inflation and primordial black hole production
• Beware of the running $n_s$ when producing heavy primordial black holes
• Primordial black holes and scalar-induced gravitational waves from the polynomial attractor model
• Primordial black holes and scalar induced gravitational waves from sound speed resonance in non-minimal derivative coupling inflation model