Primordial black holes from QCD axion bubbles
We propose a scenario in which a strong Peccei-Quinn (PQ) symmetry breaking in the early universe results in large inhomogeneities of the initial QCD axion field value, leading to the formation of very dense axion bubbles. Some of the axion bubbles subsequently collapse into primordial black holes (...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2020-11, Vol.2020 (11), p.60-60, Article 060 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2020 |
| creator | Kitajima, Naoya Takahashi, Fuminobu |
| description | We propose a scenario in which a strong Peccei-Quinn (PQ) symmetry breaking in the early universe results in large inhomogeneities of the initial QCD axion field value, leading to the formation of very dense axion bubbles. Some of the axion bubbles subsequently collapse into primordial black holes (PBHs). The spatially homogeneous part of the QCD axion explains dark matter of the universe, while the PBHs arising from the axion bubbles can explain the LIGO events or the seed of supermassive black holes. Interestingly, the mass of PBH is determined by the axion decay constant; for f(a) = 10(17) (10(16)) GeV, the PBH mass is heavier than about 10(10(4))M-circle dot. In addition, axion miniclusters are also formed from the axion bubbles more abundantly than PBHs, and their masses are expected to be heavier than in the usual scenario based on the spontaneous breaking of the PQ symmetry after inflation. |
| doi_str_mv | 10.1088/1475-7516/2020/11/060 |
| format | Article |
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Some of the axion bubbles subsequently collapse into primordial black holes (PBHs). The spatially homogeneous part of the QCD axion explains dark matter of the universe, while the PBHs arising from the axion bubbles can explain the LIGO events or the seed of supermassive black holes. Interestingly, the mass of PBH is determined by the axion decay constant; for f(a) = 10(17) (10(16)) GeV, the PBH mass is heavier than about 10(10(4))M-circle dot. 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| source | IOP Publishing Journals; Web of Science - Science Citation Index Expanded - 2020<img src="https://exlibris-pub.s3.amazonaws.com/fromwos-v2.jpg" />; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Astronomy & Astrophysics Broken symmetry Bubbles Dark matter Decay rate Physical Sciences Physics Physics, Particles & Fields Science & Technology Supermassive black holes Universe |
| title | Primordial black holes from QCD axion bubbles |
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