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Resonant excitation of the axion field during the QCD phase transition
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abstract
We find that the adiabatic fluctuations produced in the primordial plasma by cosmological inflation resonantly excite the axion field during the QCD phase transition by pumping axions from low momentum modes to modes with momentum up to of order $\sqrt{3} m$ where $m$ is the axion mass. We derive the momentum distribution of the excited axions. The fraction of cold axions that get excited is of order one if the axion mass is larger than a few $\mu$eV. The effect occurs whether inflation happens before or after the Peccei-Quinn phase transition.
Forward citations
Cited by 2 Pith papers
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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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