Axion searches with Fermi and IACTs
Axion Like Particles (ALPs), postulated to solve the strong-CP problem, are predicted to couple with photons in the presence of magnetic fields, which may lead to a significant change in the observed spectra of gamma-ray sources such as AGNs. Here we simultaneously consider in the same framework both the photon/axion mixing that takes place in the gamma-ray source and that one expected to occur in
Photon-axion mixing and ultra-high-energy cosmic rays from BL Lac type objects -- Shining light through the Universe
Photons may convert into axion like particles and back in the magnetic field of various astrophysical objects, including active galaxies, clusters of galaxies, intergalactic space and the Milky Way. This is a potential explanation for the candidate neutral ultra-high-energy (E>10^18 eV) particles from distant BL Lac type objects which have been observed by the High Resolution Fly's Eye experiment.
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http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000079000010107301000001&idtype=cvips&gifs=yes
Active Galactic Nuclei Shed Light on Axion-like-Particles
University of Chicago Press Journals: Cookie absent
Searching for decaying axion-like dark matter from clusters of galaxies
