New scenario of QCD axion clump formation I: Linear analysis
arXiv:2111.05785 · doi:10.1088/1475-7516/2022/03/039
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.
27 pages, 13 figures
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- QCD Axion Kinetic Misalignment without Prejudice
- Oscillon spectroscopy
- New Constraints on Dark Matter and Cosmic Neutrino Profiles through Gravity
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- Dark photon dark matter from flattened axion potentials
- ALP Dark Matter from Kinetic Fragmentation: Opening up the Parameter Window