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Primordial Origin of Supermassive Black Holes from Axion Bubbles

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arxiv 2310.13333 v1 pith:7FXO3FI7 submitted 2023-10-20 astro-ph.CO hep-ph

Kentaro Kasai , Masahiro Kawasaki , Naoya Kitajima , Kai Murai , Shunsuke Neda , Fuminobu Takahashi This is my paper · ORCID
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keywords axionblackbubblesholeslargemodelpbhsprimordial
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We study a modification of the primordial black hole (PBH) formation model from axion bubbles. We assume that the Peccei-Quinn scalar rolls down in the radial direction from a large field value to the potential minimum during inflation, which suppresses the axion fluctuations and weakens the clustering of PBHs on large scales. We find that the modified model can produce a sufficient number of PBHs that seed the supermassive black holes while avoiding the observational constraints from isocurvature perturbations and angular correlation of the high-redshift quasars.

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  1. Primordial Black Hole Formation via Inverted Bubble Collapse

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

    Isolated bubbles from an incomplete phase transition, inverted into false-vacuum regions by a later bulk transition, collapse into nearly monochromatic primordial black holes up to about 10^-5 solar masses.

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