Dark matter may emit ultra-high energy cosmic rays


By Anil Ananthaswamy THE nature of dark matter and the source of ultra-high energy cosmic rays are two of the biggest unsolved mysteries in physics. A mammoth instrument nearing completion in Argentina could soon tell us whether the two questions are linked. According to standard physics, cosmic rays with energies greater than about 5 × 1019 electronvolts collide with photons of the cosmic microwave background left over from the big bang and so lose energy over long distances. This puts a limit on how energetic they are when they reach Earth, called the Greisen-Zatsepin-Kuzmin (GZK) cut-off. So,
  • 首页
  • 游艇租赁
  • 电话
  • 关于我们