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

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arxiv 2211.14262 v2 pith:O5S47TQZ submitted 2022-11-25 astro-ph.CO gr-qchep-phhep-th

Matteo Braglia , Andrei Linde , Renata Kallosh , Fabio Finelli This is my paper · ORCID
classification astro-ph.COgr-qchep-phhep-th
keywords alphaattractorsblackgravitationalholeshybridprimordialattractor
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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).

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Cited by 13 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Superhorizon curvature perturbations in hybrid inflation revisited

    astro-ph.CO 2026-06 unverdicted novelty 6.0 of 10

    Hybrid inflation's waterfall tachyonic instability grows isocurvature modes that convert to curvature perturbations at the field-space turn, yielding a k^{3}-peaked spectrum with always-positive f_NL that enhances PBH...

  2. DeepInflation: an AI agent for research and model discovery of inflation

    astro-ph.CO 2026-01 conditional novelty 6.0 of 10

    An LLM agent with symbolic regression finds simple inflation potentials that match target CMB observables, but the outputs are fitted to the targets rather than independently predicted.

  3. Reconstructing Primordial Curvature Perturbations via Scalar-Induced Gravitational Waves with LISA

    astro-ph.CO 2025-01 conditional novelty 6.0 of 10

    LISA can reconstruct the primordial curvature power spectrum from scalar-induced gravitational waves, with percent-level precision near the peak and Bayesian tests separating SIGWs from other sources.

  4. Axion misalignment with memory-burdened PBH

    hep-ph 2025-01 conditional novelty 6.0 of 10

    Axion dark matter parameter space shifts dramatically when kinetic misalignment and memory-burdened primordial black hole evaporation are combined.

  5. How Well Do We Know the Scalar-Induced Gravitational Waves?

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    Non-Gaussian curvature perturbations, related to Gaussian ones by a logarithmic mapping, can make the scalar-induced gravitational wave background much larger or smaller than the standard quadratic calculation predicts.

  6. Testing inflation on all scales: a case study with $\alpha$-attractors

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    A subset of hybrid alpha-attractor inflation models passes all large- and small-scale constraints and predicts scalar-induced gravitational waves detectable by LISA.

  7. Waterfall-modulated $\alpha$-attractors

    astro-ph.CO 2026-08 accept novelty 5.0 of 10

    Waterfall steps in single-field alpha-attractor potentials increase the effective number of e-folds, raising ns toward 1 and lowering r along the curve r = 3 alpha (1 - ns)^2.

  8. Inflation, Open Universes, and Dark Energy

    astro-ph.CO 2026-07 conditional novelty 5.0 of 10

    A slightly open universe with Ω_k ≈ 3×10^{-3} pulls n_s down to ~0.969, reconciling plateau inflation models with combined CMB and DESI data.

  9. Are Primordial Black Holes Truly Fine-Tuned?

    astro-ph.CO 2025-12 conditional novelty 5.0 of 10

    Using a normalized sensitivity measure γ=c/c̄, the authors find γ≈1 for three single-field ultra-slow-roll inflation models and conclude PBH production is not technically unnatural.

  10. Can the universe experience an AdS landscape since matter-radiation equality?

    gr-qc 2025-06 conditional novelty 5.0 of 10

    A universe with an AdS (negative cosmological constant) phase at recombination and another at low redshift is compatible with Planck, DESI, Pantheon Plus and SH0ES data, though not preferred by them.

  11. Waterfall phase in supersymmetric hybrid inflation

    hep-ph 2025-07 conditional novelty 4.0 of 10

    Waterfall-phase e-foldings in R-symmetric SUSY hybrid inflation can produce a PTA-compatible scalar-induced gravitational wave background and, in SU(5), dilute monopoles to observable levels.

  12. Dark energy and lensing anomaly in Planck CMB data

    astro-ph.CO 2025-02 conditional novelty 4.0 of 10

    When the Planck lensing amplitude AL is fitted freely, DESI+CMB+SN data no longer prefer evolving dark energy, and DESI BAO's lower matter density worsens the lensing anomaly in LambdaCDM.

  13. The Hubble tension: A decade review

    astro-ph.CO 2026-06 unverdicted novelty 3.0 of 10

    Pure early or late fixes to the Hubble tension are tightly constrained; remaining options are combined early-late interacting dark energy or new physics at the local-to-homogeneous transition.

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