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Axion production via trapped misalignment from Peccei-Quinn symmetry breaking
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abstract
The Peccei-Quinn (PQ) symmetry does not need to be exact, and even a tiny source of PQ breaking not aligned with the QCD anomaly might have significant phenomenological implications. In this study, we examine the effects of a general class of PQ-breaking operators on the axion cosmological production via misalignment, focussing on both temperature-dependent and independent PQ-breaking potentials. In particular, we show that a variant of the trapped misalignment mechanism can delay the onset of axion oscillation, leading to an axion dark matter window with $m_a \gg 10^{-5}$ eV. This scenario is testable through various experimental approaches, including standard axion haloscopes and helioscopes, as well as searches for electric dipole moments and axion-mediated forces.
Forward citations
Cited by 5 Pith papers
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Thermal Alignment as a Pathway to Axion Dark Matter
A thermal bath that damps an axion also imprints fluctuations, and this paper derives a covariance bound plus a gauge model in which one transition determines the late axion phase space as dark matter.
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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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Bias with a Timer: Axion Domain Wall Decay and Dark Matter
A light spectator field first creates and later disables an extra axion potential, letting axion domain walls decay and matching dark matter at larger decay constants.
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Impact of First-order Electroweak Phase Transition on QCD Axion
A temporary axion mass spike during a first-order electroweak phase transition can make the QCD axion dark matter over a wide range of decay constants without a tuned initial angle.
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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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