AXION EMISSION BY MAGNETIC-FIELD-INDUCED CONVERSION OF LONGITUDINAL PLASMONS - ART. NO. 055008

Magnetic fields mix axions with photons, allowing for the cyclotron pr ocess e(-)-->e(-)a by virtue of an intermediate plasmon even if axions do not couple to electrons at the tree level. The axion and longitudi nal-plasmon dispersion relations always cross for a certain wave numbe r, leading to a resonant enhancement of this process. Even then, howev er, it cannot quite compete with the usual nucleon processes in a supe rnova core. The well-known axion window 10(-5) eV less than or similar to m(a)less than or similar to 10(-2) eV remains open and axions may still constitute the cosmic dark matter. [S0556-2821(98)03117-8].