Generating PBHs and small-scale GWs in two-field models of inflation

Abstract

Primordial black holes (PBHs) generated by gravitational collapse of large primordial overdensities can be a fraction of the observed dark matter. In this paper, we introduce a mechanism to produce a large peak in the primordial power spectrum (PPS) in two-field inflationary models characterized by two stages of inflation based on a large non-canonical kinetic coupling. This mechanism is generic to several two-field inflationary models, due to a temporary tachyonic instability of the isocurvature perturbations at the transition between the two stages of inflation. We numerically compute the primordial perturbations from largest scales to the small scales corresponding to that of PBHs using an extension of BINGO (BI-spectra and Non-Gaussianity Operator). Moreover we numerically compute the stochastic background of gravitational waves (SBGW) produced by second order scalar perturbations within frequencies ranging from nano-Hz to KHz that covers the observational scales corresponding to Pulsar Timing Arrays, Square Kilometer Array to that of Einstein telescope. We discuss the prospect of its detection by these proposed and upcoming gravitational waves experiments.

20 pages, 7 figures; v2 matches the version published on JCAP

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Cited by in corpus (15)

• Gravitational Waves Induced by Scalar Perturbations with a Lognormal Peak
• The Gravitational-Wave Physics II: Progress
• Primordial black holes and secondary gravitational waves from inflationary model with a non-canonical kinetic term
• Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
• Gravitational waves from dark matter isocurvature
• Primordial black holes and oscillating gravitational waves in slow-roll and slow-climb inflation with an intermediate non-inflationary phase
• Primordial black holes and scalar induced gravitational waves from the $E$ model with a Gauss-Bonnet term
• Double-peaked inflation model: Scalar induced gravitational waves and primordial-black-hole suppression from primordial non-Gaussianity
• Very Hairy Inflation
• Mechanisms of Producing Primordial Black Holes By Breaking The SU(2,1)/SU(2)$\times$U(1) Symmetry
• Mechanism of primordial black holes production and secondary gravitational waves in $\alpha$-attractor Galileon inflationary scenario
• Primordial Non-Gaussianity from G-inflation
• Scalar induced gravitational waves review
• Primordial blackholes from Gauss-Bonnet-corrected single field inflation
• Mimicking two field inflationary features with a single field