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Effects of Axion-Photon Mixing on Gamma-Ray Spectra from Magnetized Astrophysical Sources

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arxiv 0708.1144 v1 pith:FCF7H4JP submitted 2007-08-08 astro-ph hep-ph

Kathrin A. Hochmuth (MPI Munich) , Guenter Sigl (APC , IAP , Paris) This is my paper
classification astro-phhep-ph
keywords gamma-rayaxion-photonsourcesspectratermastrophysicalaxioncouplings
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Astrophysical gamma-ray sources come in a variety of sizes and magnetizations. We deduce general conditions under which gamma-ray spectra from such sources would be significantly affected by axion-photon mixing. We show that, depending on strength and coherence of the magnetic field, axion couplings down to ~ 1/(10**13 GeV) can give rise to significant axion-photon conversions in the environment of accreting massive black holes. Resonances can occur between the axion mass term and the plasma frequency term as well as between the plasma frequency term and the vacuum Cotton-Mouton shift. Both resonances and non-resonant transitions could induce detectable features or even strong suppressions in finite energy intervals of gamma-ray spectra from active galactic nuclei. Such effects can occur at keV to TeV energies for couplings that are currently allowed by all experimental constraints.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Axion-photon conversion in stochastic magnetic fields

    hep-ph 2025-12 accept novelty 6.0 of 10

    Axion-photon conversion in random Gaussian magnetic fields fixes the expectation values and variances of photon Stokes parameters, including a circular-polarization signal from helical fields.

  2. Gamma Rays from ALP-Photon Conversion and Inverse Compton Reprocessing in Neutron Star Magnetospheres

    astro-ph.HE 2026-08 conditional novelty 5.0 of 10

    ALP-to-photon conversion near four pulsars produces mostly sub-MeV emission: Fermi-LAT is insensitive to the channel, COMPTEL data already exclude new parameter space at high ALP mass, and COSI could probe much more.

  3. Dimming of Photon Ring due to Photon-Axion Conversion around Kerr Black Holes

    gr-qc 2026-05 unverdicted novelty 5.0 of 10

    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.

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