Author/Authors :
A.D. Dolgov، نويسنده , , S.H. Hansen، نويسنده , , G. Raffelt، نويسنده , , D.V. Semikoz، نويسنده ,
Abstract :
Cosmological and astrophysical effects of heavy (10–200 MeV) sterile Dirac neutrinos, mixed with the active ones, are considered. The bounds on mass and mixing angle from both supernovae and big-bang nucleosynthesis are presented.