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QCD Axion Dark Matter with a Small Decay Constant
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abstract
The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant $f_a \sim \mathcal{O}(10^{11})$ GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires $f_a \sim (10^8 -10^{11})$ GeV. The axions may be warm enough to give deviations from cold dark matter in Large Scale Structure.
Forward citations
Cited by 8 Pith papers
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Dark Matter and Baryon Asymmetry from Monopole-Axion Interactions
A rotating QCD axion dissipates kinetic energy via dark monopole dyon transitions, explaining dark matter and baryon asymmetry with a predicted axion decay constant below 10^9 GeV.
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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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Feebly-Interacting Peccei-Quinn Model
A feebly-interacting PQ scalar with large wave-function renormalization can generate a large axion decay constant while keeping all mass scales near the TeV scale, predicting a light PQ Higgs and new dark matter scenarios.
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Particle decay as asymptotic narrow parametric resonance
A Boltzmann equation with Gaussian momentum spread reproduces the asymptotic growth rate and number density of narrow parametric resonance to within about 20 percent.
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Preheating Axions in String Cosmology
Preheating of closed-string axions in fibre inflation can overproduce dark matter, yielding new upper bounds on the axion mass and constraints on model parameters.
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Exploring the Landscape of Spontaneous CP Violation in Supersymmetric Theories
Spontaneous CP violation is realized in SUSY via an extended spurion formalism in the exact limit and a model with intermediate-scale breaking along pseudo-flat directions stabilized by soft terms and non-perturbative...
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Universal lower bound on the axion decay constant from free streaming effects
Abundance-boosted axion dark matter generically produces warm nonzero-momentum modes, so Lyman-alpha free-streaming and isocurvature bounds exclude fa below about 10^14-10^15 GeV (10^-18 eV/ma) for most ultralight axi...
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Type II Seesaw Leptogenesis in a Majoron background
Spontaneous wash-in leptogenesis in Type II Seesaw with Majoron pNGB background enables baryon asymmetry generation alongside dark matter cogenesis for specific v_T, v_sigma and m_j ranges.
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