Hybrid $\alpha$-attractors, primordial black holes and gravitational wave backgrounds

Abstract

We investigate the two-stage inflation regime in the theory of hybrid cosmological $\alpha$-attractors. The spectrum of inflationary perturbations is compatible with the latest Planck/BICEP/Keck results, thanks to the attractor properties of the model. However, at smaller scales, it may have a very high peak of controllable width and position, leading to a copious production of primordial black holes (PBH) and generation of a stochastic background of gravitational waves (SGWB).

39 pages, 12 figures, v2: references added, minor modifications, matches JCAP version

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Cited by in corpus (40)

• 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
• Inflation, the Hubble Tension and Early Dark Energy: an alternative overview
• Enhancement of primordial curvature perturbations in $R^3$-corrected Starobinsky-Higgs inflation
• 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
• Inflationary Potential as seen from Different Angles: Model Compatibility from Multiple CMB Missions
• No-go guide for the Hubble tension: late-time or local-scale new physics
• Obviating PBH overproduction for SIGWs generated by Pulsar Timing Arrays in loop corrected EFT of bounce
• $\alpha$-attractor inflation: Models and predictions
• Quest for CMB spectral distortions to probe the scalar-induced gravitational wave background interpretation of pulsar timing array data
• Starting inflation from inhomogeneous initial conditions with momentum
• Testing the $n_s-H_0$ scaling relation with Planck-independent CMB data
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• On the primordial black hole formation in hybrid inflation
• Imprint of PBH domination on gravitational waves generated by cosmic strings
• Gravity-improved metastability bounds for the Type-I Seesaw Mechanism
• Untangling PBH overproduction in $w$-SIGWs generated by Pulsar Timing Arrays for MST-EFT of single field inflation
• Mechanisms for producing Primordial Black Holes from Inflationary Models Beyond Fine-Tuning
• Production of primordial black holes in improved E-models of inflation
• Constraining ultra slow roll inflation using cosmological datasets
• Enhanced power spectra from multi-field inflation
• Primordial Black Holes and Scalar-induced Gravitational Waves in Sneutrino Hybrid Inflation
• Exploring primordial black holes and gravitational waves with R-symmetric GUT Higgs inflation
• Meso-inflationary Peccei-Quinn symmetry breaking with non-minimal coupling
• Primordial Black Holes in Induced Gravity Inflationary Models with Two Scalar Fields
• Primordial black holes save $R^2$ inflation
• Primordial Black Holes and Second-order Gravitational Waves in Axion-like Hybrid Inflation
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• Hybrid inflation and gravitational waves from accidentally light scalars
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• Primordial black holes formation in inflationary $F(R)$ models with scalar fields
• Inflationary $\alpha$-Attractor Models with Singular Derivative of Potential
• New Integrable Chiral Cosmological Models with Two Scalar Fields
• Development of generic no-scale inflation