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Thermal axion production
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We reconsider thermal production of axions in the early universe, including axion couplings to all Standard Model (SM) particles. Concerning the axion coupling to gluons, we find that thermal effects enhance the axion production rate by a factor of few with respect to previous computations performed in the limit of small strong gauge coupling. Furthermore, we find that the top Yukawa coupling induces a much larger axion production rate, unless the axion couples to SM particles only via anomalies.
Forward citations
Cited by 16 Pith papers
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How to Identify a Majoron: Effective Field Theories of Spontaneous Lepton Number Breaking
Seesaw Majoron models imply parameter-free correlations among Higgs, muon decay, and neutrino observables that can identify the neutrino mass mechanism.
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Axiverse Lampposts
In a hierarchical multi-axion theory with random couplings, axion field ranges shrink with 1/sqrt(N), generic axion–SM couplings are suppressed, but the QCD axion's coupling is unsuppressed.
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Beyond thermal approximations: Precise cosmological bounds on Axion-Like Particles
Solving the momentum-dependent Boltzmann equation and propagating the exact non-thermal ALP spectrum into CMB analyses yields 95% limits f_a>1.63e6 GeV (e), 9.41e6 GeV (mu), 8.06e4 GeV (tau), and g_a_gamma<1.98e-8 GeV^-1.
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Improved cosmological constraints on axion-lepton interactions
For axion masses above 0.1 eV, cosmology provides the strongest known limits on axion couplings to muons, taus, and flavor-violating tau channels, excluding decay constants up to 10^8 GeV.
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Comprehensive ALP Searches in Meson Decays
A new open-source tool, ALPaca, computes axion-like particle constraints from meson decays and finds that only the non-universal DFSZ model with large tan beta can explain the Belle II B+ to K+ plus missing energy exc...
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Multiple Soft Scatterings in Scalar Dark Matter Freeze-In
A new calculation of the Landau-Pomeranchuk-Migdal effect for scalar dark matter production shows that it can add up to roughly 27 percent to the predicted relic abundance.
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ALP Production from Abelian Gauge Bosons: Beyond Hard Thermal Loops
ALP production from a hot Abelian plasma is computed with full 1PI-resummed propagators, giving positive rates at all momenta and revealing dominant timelike-timelike photon contributions at very soft ALP momenta.
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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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Energy and momentum dependence of the soft-axion interaction rate
HTL computation of soft axion rates shows interpolation between k=0 and k≈ω, raising ΔN_eff from ~0.03 to ~0.04 for light QCD axions at fa=4×10^8 GeV.
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Viability of warm inflation with standard model interactions
Using the WI2easy code, the Standard Model gluon-coupled warm inflation model remains viable, with a Hubble-exit dissipation ratio Q* between 0.0076 and 30 and inflaton thermalization for Q* above about 0.08.
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QCD Axion on Hilltop by a Phase Shift of $\pi$
A heavy axion inflaton can shift the QCD axion potential by π, placing the QCD axion at the hilltop and allowing f_a ≳ 3×10^9 GeV to explain all dark matter.
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Axion contribution to the mass-radius relation of neutron stars
Trapped, thermalized axions add radiation pressure that increases the neutron-star mass at high temperatures, up to a claimed causality limit near 7.8 x 10^7 eV.
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Dark matter from axion and small neutrino mass
A KSVZ-like model with a fermion dark matter candidate produced by UV freeze-in through the axion portal is shown to have viable parameter space at TeV mass and axion decay constant near 10^10 to 10^11 GeV.
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CMB-S4 Science Case, Reference Design, and Project Plan
Presents the science case, reference design, and project plan for the CMB-S4 ground-based CMB experiment.
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Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments
The meV axion window is presented as a coherent, cross-validated search program in which string theory, stellar cooling, dark matter, and new detector concepts converge on the same mass range.
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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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