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Gravitational waves from axion-like particle cosmic string-wall networks
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abstract
Axion-like particles (ALPs) are a compelling candidate for dark matter (DM), whose production is associated with the formation of a string-wall network. If walls bounded by strings persist, which requires the potential to have multiple local minima ($N>1$), they must annihilate before they become dominant. They annihilate mostly into gravitational waves and non-relativistic ALPs. We show that for ALPs other than the QCD axion these gravitational waves, if produced at temperatures below 100 eV, could be detected by future cosmological probes for ALPs with mass from $10^{-16}$ to $10^{6}$ eV that could constitute the entirety of the DM.
Forward citations
Cited by 2 Pith papers
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Monodromic transparency of axion domain walls
Axion domain walls become transparent to low-energy photons at E/N=8/3 because of axion-pion cancellation, making thermal friction scale as T^8 rather than e^{-ma/T}.
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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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