Constraining photon–axion oscillations using quasar spectra

  title={Constraining photon–axion oscillations using quasar spectra},
  author={Edvard Mortsell and Ariel Goobar},
  journal={Journal of Cosmology and Astroparticle Physics},
Using quasar spectra from the SDSS survey, we constrain the possibility of photon–axion oscillations as a source of dimming of high redshift objects. Such a process has been suggested as an explanation of the apparent faintness of distant Type Ia supernovae. For most combinations of magnetic field strengths and plasma densities along the line of sight, large beam attenuations in broad-band filters would also lead to significant differential attenuation, not observed in the quasar sample… 
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