Axion-Like Particles, Cosmic Magnetic Fields and Gamma-Ray Astrophysics
Alessandro De Angelis (1), Oriana Mansutti (1), Marco Roncadelli (2), ((1) University of Udine, INFN Udine-Trieste, (2) University of Pavia and, INFN Pavia)
TL;DR
This paper explores how axion-like particles interacting with cosmic magnetic fields can cause observable distortions in gamma-ray spectra from distant sources, potentially detectable by upcoming gamma-ray telescopes.
Contribution
It demonstrates that photon-ALP mixing in cosmic magnetic fields can produce detectable spectral distortions in gamma-ray sources within current ALP parameter constraints.
Findings
Photon-ALP mixing causes spectral distortions in gamma-ray sources.
Effects are observable in the 100 MeV - 100 GeV energy range.
Potential detection with upcoming gamma-ray missions like GLAST.
Abstract
Axion-Like Particles (ALPs) are predicted by many extensions of the Standard Model and give rise to characteristic dimming and polarization effects in a light beam travelling in a magnetic field. In this Letter, we demonstrate that photon-ALP mixing in cosmic magnetic fields produces an observable distortion in the energy spectra of distant gamma-ray sources (like AGN) for ranges of the ALP parameters allowed by all available constraints. The resulting effect is expected to show up in the energy band 100 MeV - 100 GeV, and so it can be serched with the upcoming GLAST mission.
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