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Axion Dark Matter in the Time of Primordial Black Holes

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arxiv 2107.13575 v3 pith:QUO76KT4 submitted 2021-07-28 hep-ph

Nicolás Bernal , Fazlollah Hajkarim , Yong Xu This is my paper · ORCID
classification hep-ph
keywords axiondarkmatterpbhsabundanceaxionsblackfuture
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We investigate the production of QCD axion dark matter in a nonstandard cosmological era triggered by primordial black holes (PBHs) that fully evaporate before the onset of BBN. Even if PBHs cannot emit the whole axion cold dark matter abundance through Hawking radiation, they can have a strong impact on the dark matter produced via the misalignment mechanism. First, the oscillation temperature of axions reduces if there is a PBH dominated era, and second, PBH evaporation injects entropy to the standard model, diluting the axion relic abundance originally produced. The axion window is therefore enlarged, reaching masses as light as $\sim 10^{-8}$ eV and decay constants as large as $f_{a}\sim 10^{14}$ GeV without fine tuning the misalignment angle. Such small masses are in the reach of future detectors as ABRACADABRA, KLASH, and ADMX, if the axion couples to photons. Additionally, the axions radiated by PBHs contribute to $\Delta N_\text{eff}$ within the projected reach of the future CMB Stage 4 experiment.

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Cited by 5 Pith papers

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

  1. Catalogues of Cosmologically Self-Consistent Hadronic QCD Axion Models

    hep-ph 2024-12 conditional novelty 7.0 of 10

    Hadronic axion models with d=6 and d=7 heavy-quark decay operators can produce two new cosmologically viable 'islands' at f_a ~ 10^12 and 10^14 GeV, extending the post-inflationary axion search window.

  2. Page Time of Primordial Black Holes in the Standard Model and Beyond

    astro-ph.CO 2025-02 conditional novelty 6.0 of 10

    For Standard Model emission, a Schwarzschild primordial black hole of about 6.23 x 10^14 grams would reach its Page time at the current age of the Universe.

  3. 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.

  4. Probing Double-Peaked Gamma-Ray Spectra from Primordial Black Holes with Next-Generation Gamma-Ray Experiments

    hep-ph 2025-07 conditional novelty 4.0 of 10

    A likelihood forecast shows e-ASTROGAM could, in parts of the f1-f2 plane, distinguish double-peaked from single-peaked PBH gamma-ray spectra in the 1e15 to 1e17 g mass window.

  5. Asymmetries from a charged memory-burdened PBH

    hep-ph 2024-12 reject novelty 3.0 of 10

    A parameter-space scan shows that very large curvature-current couplings can fit the baryon asymmetry and dark matter abundance, while the electric charge of the black hole plays no role in the mechanism.

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