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New scenario of QCD axion clump formation I: Linear analysis
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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.
Forward citations
Cited by 3 Pith papers
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Soft Oscillons
Scalar fields with plateau potentials support soft oscillons: localized, long-lived oscillations with arbitrarily large radius, frequency set by the radius, and evaporation power scaling linearly or quadratically with radius.
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Amnesia in the Axion Misalignment Landscape
Kinetic misalignment fragmentation drives the small-scale axion spectrum toward the same attractor as post-inflationary axions, largely erasing the memory of the initial misalignment angle and velocity.
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Axion Perturbations: A General Analytical Treatment
Axion dark-matter perturbations are determined entirely by the homogeneous axion background's dependence on its initial misalignment angle, plus Weinberg's universal adiabatic-mode term.
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