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Astrophysics > Cosmology and Nongalactic Astrophysics

arXiv:2111.05785 (astro-ph)
[Submitted on 10 Nov 2021 (v1), last revised 18 Mar 2022 (this version, v2)]

Title:New scenario of QCD axion clump formation I: Linear analysis

Authors:Naoya Kitajima, Kazuhiro Kogai, Yuko Urakawa
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Abstract:The QCD axion acquires the potential through the non-perturbative effect of the QCD matters around the QCD phase transition. During this period, the direct interaction between the axion and the QCD matters sets in. Focusing on the impact of this direct interaction, we propose two scenarios where the fluctuation of the axion can rapidly grow, potentially leading to the formation of axion miniclusters even if the Peccei-Quinn (PQ) symmetry was already broken during inflation. The first scenario assumes that the primordial curvature perturbation at the horizon scale during the QCD epoch was significantly enhanced and the second one assumes that the initial misalignment was tuned around the hilltop of the potential.
Comments: 27 pages, 13 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
Report number: TU1139, KEK-TH-2367, KEK-Cosmo-0281
Cite as: arXiv:2111.05785 [astro-ph.CO]
  (or arXiv:2111.05785v2 [astro-ph.CO] for this version)
  https://doi.org/10.48550/arXiv.2111.05785
Related DOI: https://doi.org/10.1088/1475-7516/2022/03/039

Submission history

From: Kazuhiro Kogai [view email]
[v1] Wed, 10 Nov 2021 16:36:58 UTC (5,723 KB)
[v2] Fri, 18 Mar 2022 00:59:30 UTC (5,723 KB)
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