Mass limits for heavy neutrinos

Neutrinos heavier than $M_Z/2\sim 45$ GeV are not excluded by particle physics data. Stable neutrinos heavier than this might contribute to the cosmic gamma ray background through annihilation in distant galaxies as well as to the dark matter content of the universe. We calculate the evolution of the heavy neutrino density in the universe as a function of its mass, $M_N$, and then the subsequent gamma ray spectrum from annihilation of distant $N\bar{N}$ (from $0

Keywords:

• Structure formation
• Dark matter
• Universe
• Annihilation
• Egret
• Astrophysics
• Neutrino
• Gamma ray
• Galaxy
• Physics

• Correction
• Source
• Cite
• Save
• Machine Reading By IdeaReader