Radiative decay of keV-mass sterile neutrinos in a strongly magnetized   plasma
  The radiative decay of sterile neutrinos with typical masses of 10 keV is investigated in the presence of a strong magnetic field and degenerate plasma. Full account is taken of the strongly modified photon dispersion relation relative to vacuum. The limiting cases of relativistic and non-relativistic plasma are analyzed. The decay rate in a strongly magnetized plasma as a function of the electron number density is compared with the un-magnetized case. We find that a strong magnetic field suppresses the catalyzing influence of the plasma on the decay rate. 
Alexandra A. Dobrynina, Nicolay V. Mikheev, Georg G. Raffelt
hep-ph