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The Irreducible Axion Background
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abstract
Searches for dark matter decaying into photons constrain its lifetime to be many orders of magnitude larger than the age of the Universe. A corollary statement is that the abundance of any particle that can decay into photons over cosmological timescales is constrained to be much smaller than the cold dark-matter density. We show that an $\textit{irreducible}$ freeze-in contribution to the relic density of axions is in violation of that statement in a large portion of the parameter space. This allows us to set stringent constraints on axions in the mass range $100\rm \;eV - 100\; MeV$. At $10\rm \; keV$ our constraint on a photophilic axion is $g_{a\gamma \gamma} \lesssim 8.1 \times 10^{-14}~{\rm GeV}^{-1}$, almost three orders of magnitude stronger than the bounds established using horizontal branch stars; at $100~{\rm keV}$ our constraint on a photophobic axion coupled to electrons is $g_{aee} \lesssim 8.0 \times 10^{-15}$, almost four orders of magnitude stronger than present results. Although we focus on axions, our argument is more general and can be extended to, for instance, sterile neutrinos.
Forward citations
Cited by 9 Pith papers
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Loop-Level Lepton Flavor Violation and Diphoton Signals in the Minimal Left-Right Symmetric Model
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Improved cosmological constraints on axion-lepton interactions
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Probing the Cosmic Axion Background via Axion-Photon Conversion in Filaments
Axion-photon conversion in cosmic filaments would turn dark-matter decay into a gamma-ray background, and the calculated flux excludes axion masses below ~10^-5 eV for GeV–TeV dark matter with lifetimes below ~10^30 s.
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Neutrino lines and photon continua from cascade dark matter decay
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