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Non-Canonical Inflation and Primordial Black Holes Production

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arxiv 1812.02547 v2 pith:IZKTEJZB submitted 2018-12-06 gr-qc astro-ph.COhep-phhep-th

Alexander Y. Kamenshchik , Alessandro Tronconi , Tereza Vardanyan , Giovanni Venturi This is my paper · ORCID
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keywords duringinflationscalaramplificationblackfieldformholes
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abstract

We study a mechanism for the amplification of the inflationary scalar perturbation when the inflaton field action is non-canonical, i.e. the inflaton kinetic term has a non-standard form. For such a case the speed of sound of the perturbations generated during inflation is less than one and in general changes with time. Furthermore in such models, even when the scalar field potential is negligible, diverse inflationary attractors may exist. The possible effects of a speed of sound approaching zero during some stage of inflation may lead to a large amplification for the amplitude of the scalar spectrum which, on horizon re-entry during the radiation dominated phase, can collapse and form primordial black holes (PBH) of a mass $M_{\rm BH}\sim 10^{-15}M_{\odot}$ which may constitute a large fraction of the total Dark Matter (DM) today.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 88 citations worldwide. Full citation record

  1. Primordial Black Holes from Vector-Induced Curvature Perturbations Sourced by Primordial Magnetic Fields

    gr-qc 2026-06 unverdicted novelty 7.0 of 10

    Vector modes from primordial magnetic fields remain constant in a kination epoch and source second-order curvature perturbations scaling as P_R(k) ∝ k^{-5}, sufficient for PBH dark matter abundance in a Ratra-type mag...

  2. Constraining inflation with nonminimal derivative coupling with the Parkes Pulsar Timing Array third data release

    gr-qc 2024-12 conditional novelty 6.0 of 10

    Using PPTA DR3 data, the authors report 90% constraints on the nonminimal derivative coupling inflation parameters φc, ωL, and σ, with Bayes factor 0.9 against a power-law background.

  3. Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity

    gr-qc 2025-12 conditional novelty 5.0 of 10

    A kinetic cubic Horndeski coupling creates an ultra-slow-roll phase that amplifies curvature perturbations enough to produce asteroid-mass primordial black holes, potentially 90% of dark matter.

  4. Primordial black holes formation in inflationary $F(R)$ models with scalar fields

    gr-qc 2025-09 unverdicted novelty 5.0 of 10

    Authors add induced gravity and a polynomial potential to an F(R) model, transform to a two-field chiral cosmology, and find parameter choices that match ACT inflation data while yielding PBH masses compatible with da...

  5. Exploring Gravitational Wave Signatures Due to Primordial Non-gaussianity and Large Scale Structure Using SKAO

    astro-ph.CO 2026-06 unverdicted novelty 4.0 of 10

    Explores SKAO detection of scalar-induced GW backgrounds as probes of primordial non-Gaussianity and parity violation, with LSS cross-correlation to improve SNR.

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