Geodesic
Axions and cosmic rays
Teoretičeskaâ i matematičeskaâ fizika, Tome 170 (2012) no. 2, pp. 304-320 Cet article a éte moissonné depuis la source Math-Net.Ru

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We investigate the propagation of a charged particle in a spatially constant but time-dependent pseudoscalar background. Physically, this pseudoscalar background could be provided by a relic axion density. The background leads to an explicit breaking of Lorentz invariance; processes such as $p \longrightarrow p\gamma$ or $e\longrightarrow e\gamma$ are consequently possible under some kinematic constraints. The phenomenon is described by the QED Lagrangian extended with a Chern–Simons term that contains a four-vector characterizing the breaking of Lorentz invariance induced by the time-dependent background. While the induced radiation (similar to the Cherenkov effect) is too small to influence the propagation of cosmic rays significantly, the hypothetical detection of the photons radiated by high-energy cosmic rays via this mechanism would provide an indirect way to verify the cosmological relevance of axions. We discuss the order of magnitude of the effect.
Mots-clés : axion
Keywords: high-energy cosmic ray, galactic magnetic field. 
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D. Espriu; A. Renau. Axions and cosmic rays. Teoretičeskaâ i matematičeskaâ fizika, Tome 170 (2012) no. 2, pp. 304-320. http://geodesic.mathdoc.fr/item/TMF_2012_170_2_a12/

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