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Axion-like particles and the propagation of gamma rays over astronomical distances
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In this mini-review, possible manifestations of mixing between axion-like particles (ALPs) and energetic photons propagating over astronomical distances are considered. We discuss the evidence for the anomalous transparency of the Universe from observations of ensembles of distant gamma-ray sources, present the general formalism for the ALP-photon mixing and explain how this mechanism may remove the anomaly. We present relevant values of ALP parameters and discuss future ways to verify the scenario and to discover the particle in question.
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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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