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arXiv · 0704.3044

Signatures of axion-like particles in the spectra of TeV gamma-ray sources

Alessandro Mirizzi·Georg G. Raffelt·Pasquale D. Serpico
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Abstract

One interpretation of the unexplained signature observed in the PVLAS experiment invokes a new axion-like particle (ALP) with a two-photon vertex, allowing for photon-ALP oscillations in the presence of magnetic fields. In the range of masses and couplings suggested by PVLAS, the same effect would lead to a peculiar dimming of high-energy photon sources. For typical parameters of the turbulent magnetic field in the galaxy, the effect sets in at E_gamma >~ 10 TeV, providing an ALP signature in the spectra of TeV gamma sources that can be probed with Cherenkov telescopes. A dedicated search will be strongly motivated if the ongoing photon regeneration experiments confirm the PVLAS particle interpretation.

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Alessandro Mirizzi, Georg G. Raffelt, Pasquale D. Serpico. 2007-07-13. Signatures of axion-like particles in the spectra of TeV gamma-ray sources. https://doi.org/10.1103/physrevd.76.023001

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