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Comment on "Irregularity in gamma ray source spectra as a signature of axion-like particles"
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D. Wouters and P. Brun in Phys. Rev. D 86, 043005 (2012) claim that an observable effect in the spectra of distant very-high-energy blazars arises as a consequence of oscillations of photons into axion-like particles (ALPs) in the presence of turbulent extra-galactic magnetic fields. The main objective of this comment is to demonstrate that such a result is physically incorrect. We also show that a physically correct treatment of the same issue leads to a much less relevant conclusion, which makes the effect pointed out by WB likely unobservable with the present capabilities.
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Cited by 1 Pith paper
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On the impact of magnetic-field models in galaxy clusters on constraints on axion-like particles from the lack of irregularities in high-energy spectra of astrophysical sources
For a purely regular magnetic field in the X-ray cavity of NGC 1275, the ALP-photon coupling constraints from Fermi-LAT spectral smoothness are much weaker than for the purely turbulent field assumed in previous work,...
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