Axions and cosmic rays

作者：Espriu D^*; Renau A

来源：Theoretical and Mathematical Physics, 2012, 170(2): 249-262.

DOI：10.1007/s11232-012-0027-4

• axion
• high-energy cosmic ray
• galactic magnetic field

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 -%26gt; p gamma or e -%26gt; 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.

• 出版日期2012-2