Axions produced in supernovae generate a diffuse gamma-ray signal through conversion in magnetic fields, yielding competitive constraints on the axion-photon coupling from COMPTEL, EGRET, and Fermi-LAT data plus forecasts for future MeV telescopes.
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Introduces a sideband ladder formulation of axion electrodynamics that classifies instabilities and conversion channels via Krein signatures in periodic backgrounds.
A ferromagnetic levitated magnetometer with double-resonance mode reaches 0.7 fT magnetic resolution at 276 Hz and sets new direct limits on axionlike dark matter photon coupling g_aγ ~10^{-7} GeV^{-1} in the 40-3000 Hz band, improving prior limits by more than four orders of magnitude.
Resonant cavities enhance axion dark matter decay to two photons via the Purcell effect, offering a competitive search method implementable with pre-existing heterodyne detection schemes.
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Lights, Camera, Axion: Tracing Axions from Supernovae in the Diffuse $\gamma$-ray Sky
Axions produced in supernovae generate a diffuse gamma-ray signal through conversion in magnetic fields, yielding competitive constraints on the axion-photon coupling from COMPTEL, EGRET, and Fermi-LAT data plus forecasts for future MeV telescopes.