Axion Emission by Magnetic-Field Induced Conversion of Longitudinal Plasmons
Abstract
Magnetic fields mix axions with photons, allowing for the cyclotron process e -> e + a by virtue of an intermediate plasmon even if axions do not couple to electrons at tree level. The axion and longitudinal-plasmon dispersion relations always cross for a certain wave number, leading to a resonant enhancement of this process. Even then, however, it cannot quite compete with the usual nucleon processes in a supernova core. The well-known axion window 10-5 eV < ma < 10-2 eV remains open and axions may still constitute the cosmic dark matter.
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