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Axion Cosmology
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Outline: 1. Thermal axions 2. Axion field evolution 3. The domain wall problem 4. Cold axions 5. Axion miniclusters 6. Axion isocurvature perturbations
Forward citations
Cited by 21 Pith papers
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Big Axions
Big axions are axion models from collective spontaneous breaking of a delocalized network of U(1) symmetries that realize high-quality accidental global symmetries, solve the strong CP problem, and may explain dark matter.
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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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Spin Polarization of Proca Stars Formed by Gravitational Bose--Einstein Condensation
Gravitationally condensed Proca stars exhibit partial spin polarization controlled by the elliptical polarization of the dominant component-space mode, with ensemble mean χ_net ≈ 0.62 and large realization-to-realizat...
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Probing Axion Dark Matter via the Chiral Magnetic Effect in Zero-Bias Weyl Semimetals
Proposal to detect axion dark matter via chiral magnetic effect in Weyl semimetals, claiming observable femto-amp signals in 1 cm² samples at 10 T that can probe couplings below stellar cooling bounds.
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Probing Axion-Photon conversion via circular polarization imprints in the CMB $V$-mode observations
Proposes that axion-photon conversion in pre-CMB helical magnetic fields imprints detectable V-mode polarization in the CMB, allowing CLASS 40 GHz observations to constrain ALP masses 10^{-10} to 10^{-8} eV and their ...
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Enhanced Axion-wind near Earth's Surface
A quadratically coupled ultralight scalar field develops a spatial profile around Earth that can boost the field-gradient 'axion wind' by orders of magnitude at low masses, and a nonzero incoming velocity removes the ...
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Using $\Delta N_{\rm eff}$ to constrain preferred axion model dark matter
In preferred axion models with slow heavy-quark decays, axions produced after decoupling form dark radiation that can exceed Planck's ΔNeff bound, excluding much of the parameter space of models D and E.
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Resonant magnetogenesis from axions
Axion resonance with delayed oscillation onset can seed helical cosmic magnetic fields of about 3e-15 Gauss today with O(1) coupling.
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Axion Quark Nugget Dark Matter: Time Modulations and Amplifications
Simulated AQN dark matter crossing Earth produces relativistic axions at around 10^14 eV/cm2/s with about 10% daily and annual modulations and rare 100 to 10,000 times local flash amplifications.
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The scaling density of axion strings
Axion string networks show standard scaling with ζ0 = 1.19 ± 0.20, and the claimed logarithmic growth in string density is explained as an artifact of initial conditions.
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Large-Scale Structure Probes of the Post-Inflationary Axiverse
HST ultraviolet luminosity function data at z=4-10, combined with Lyman-α and CMB data, place leading constraints on subdominant post-inflationary axion dark matter via its white-noise isocurvature perturbations.
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Echoes in multi-ALP scenarios
In coherent multi-ALP models, axion echo power scales linearly with the number of ALPs, while incoherent (random-phase) models yield signals no stronger than the single-ALP case.
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The QCD Axion and Unification
A renormalizable SU(5) grand unified theory fixes the Peccei-Quinn scale at the unification scale, predicting the QCD axion mass in the 3 to 13 × 10^-9 eV range.
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QCD axion from broken scale symmetry
Dilaton from broken scale symmetry meets all conditions for non-compact QCD axion cosmology including non-periodicity and timely domain-wall collapse.
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Probing axion-like particles through the gamma-ray production from cosmic-ray scattering in the Milky Way dark matter halo
A sensitivity forecast shows H.E.S.S.-like, CTAO, and SWGO observations could strengthen ALP-photon coupling limits by about an order of magnitude over gamma-ray satellites and probe axion-electron couplings at lower masses.
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Tracing Ultra Light Axions in Post-reionization, Lyman-$\alpha$ and CMB Missions
Fisher forecasts indicate joint post-reionization LSS cross-spectra and CMB-S4-like data can reach O(10^{-4}) uncertainty on ultra-light axion fraction for m_a ≲ 10^{-28} eV, with peak sensitivity near 10^{-25} eV.
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Flavor phenomenology of light dark particles
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.
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Axions as Dark Matter, Dark Energy, and Dark Radiation
A mini-review of axion phenomenology showing how light bosons can account for dark matter, drive cosmic acceleration, or contribute to relativistic backgrounds in the early and late Universe.
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The landscape of QCD axion models
Review classifies QCD axion models extending the standard mass-coupling window and updates bounds from cosmology, astrophysics, and experiments.
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Axion Searches at the CERN SPS: From Their Dawn to Current Prospects
A review of axion and ALP searches at the CERN SPS, covering Barbiellini's 1982 proposal, the CHARM experiment, NA62/NA64 results, and future directions.
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Indirect detection of the QCD axion
A GBT X-band search for axion minicluster-neutron star radio transients in M31 found no 5-sigma candidates, yielding sensitivity to QCD axions in the 33-42 micro-eV mass range.
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