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Axion-Like Particles (ALPs) are predicted by many extensions of the StandardModel and give rise to characteristic dimming and polarization effects in alight beam travelling in a magnetic field. In this Letter, we demonstrate thatphoton-ALP mixing in cosmic magnetic fields produces an observable distortionin the energy spectra of distant gamma-ray sources (like AGN) for ranges of theALP parameters allowed by all available constraints. The resulting effect isexpected to show up in the energy band 100 MeV - 100 GeV, and so it can beserched with the upcoming GLAST mission.

Axion-Like Particles, Cosmic Magnetic Fields and Gamma-Ray Astrophysics