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Enhanced photon coupling of ALP dark matter adiabatically converted from the QCD axion
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We revisit the adiabatic conversion between the QCD axion and axion-like particle (ALP) at level crossing, which can occur in the early universe as a result of the existence of a hypothetical mass mixing. This is similar to the Mikheyev-Smirnov-Wolfenstein effect in neutrino oscillations. After refining the conditions for the adiabatic conversion to occur, we focus on a scenario where the ALP produced by the adiabatic conversion of the QCD axion explains the observed dark matter abundance. Interestingly, we find that the ALP decay constant can be much smaller than the ordinary case in which the ALP is produced by the realignment mechanism. As a consequence, the ALP-photon coupling is enhanced by a few orders of magnitude, which is advantageous for the future ALP and axion-search experiments using the ALP-photon coupling.
Forward citations
Cited by 9 Pith papers
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The structure of multi-axion solutions to the strong CP problem
Multi-axion theories solving the strong CP problem produce varied mass-coupling relations via a general sum rule that depends on the details of PQ symmetry breaking and anomaly alignments.
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Sign-Flipping Axion Potentials via Kapitza-Type Modulation by Heavy Axions
Coherent oscillations of a heavy axion change the sign of a light axion's effective potential, trapping it in a false vacuum and boosting its dark matter abundance.
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Resonant Landau-Zener Conversion In Multi-Axion Systems
The paper derives a Landau-Zener conversion probability for non-adiabatic axion mass-level crossings and uses it to predict two-axion dark matter abundances and haloscope targets.
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QCD Axion Dark Matter from level crossing with refined adiabatic condition
Adiabatic level crossing between a QCD axion and an ALP can convert ALP dark matter into QCD axion dark matter, and a beat-frequency-based adiabatic condition maps the viable parameter region.
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A Dynamical Solution to the Axion Domain Wall Problem
Adding a spectator PQ field with a large early-universe value and a high-dimensional S^mP mixing term can solve the axion domain wall problem and suppress isocurvature, allowing non-trivial domain wall numbers with HI...
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Hierarchical Axiverse
The paper asserts that the requirement of well-defined QCD-induced mixing alone forces ALP masses into a hierarchical spacing and decay constants into two separated populations, but it does not demonstrate the underly...
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Counting axions with IAXO
Projections for IAXO in two-axion parameter space plus spectral analysis of flavor oscillations show where the experiment can discriminate multi-axion signals from single-axion ones, extending to N-axion cases.
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Completing Axion Double Level Crossings
Double level crossings are common in multi-axion mass mixing of Z_N axions and ALPs, occurring multiple times for large N in the light axion case but prevented by excessively large or small N in light and heavy scenar...
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QCD Axion Dark Matter in the Dark Dimension
A QCD axion with decay constant around 1e9 to 1e10 GeV, as predicted in the dark dimension scenario, can supply all dark matter if an ALP of mass about 1e-5 eV and decay constant about 1e11 GeV resonantly converts into it.
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