Resonant photon-to-axion conversion in galaxy cluster magnetic fields creates a polarized CMB distortion that future experiments could use to constrain ALP couplings two orders of magnitude better than current bounds.
Electromagnetic Polarization Effects due to Axion Photon Mixing
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abstract
We investigate the effect of axions on the polarization of electromagnetic waves as they propagate through astronomical distances. We analyze the change in the dispersion of the electromagnetic wave due to its mixing with axions. We find that this leads to a shift in polarization and turns out to be the dominant effect for a wide range of frequencies. We analyze whether this effect or the decay of photons into axions can explain the large scale anisotropies which have been observed in the polarizations of quasars and radio galaxies. We also comment on the possibility that the axion-photon mixing can explain the dimming of distant supernovae.
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astro-ph.CO 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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A new probe of Axion-Like Particles: CMB polarization distortions due to cluster magnetic fields
Resonant photon-to-axion conversion in galaxy cluster magnetic fields creates a polarized CMB distortion that future experiments could use to constrain ALP couplings two orders of magnitude better than current bounds.