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

(2) University of Pavia; Alessandro De Angelis (1); INFN Pavia); INFN Udine-Trieste; Marco Roncadelli (2) ((1) University of Udine; Oriana Mansutti (1)

arxiv: 0707.2695 · v2 · submitted 2007-07-18 · 🌌 astro-ph · hep-ph

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 , INFN Pavia) This is my paper

classification 🌌 astro-ph hep-ph

keywords magneticaxion-likecosmicenergyfieldsgamma-rayparticlesallowed

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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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Dimming of Photon Ring due to Photon-Axion Conversion around Kerr Black Holes
gr-qc 2026-05 unverdicted novelty 5.0

Photon-axion conversion near Kerr black holes produces dimming of photon spectral luminosity that increases with black hole spin, magnetic field strength, and photon-axion coupling, most efficiently at high frequencies.