IN ANOTHER victory for big bang theory, astrophysicists have found hints of waves rippling through the sea of ghostly neutrino particles that fill the universe.
According to the theory, about a second after the big bang the universe became “transparent” to the neutrinos that had already been churned out in copious quantities. These neutrinos then streamed freely through space, forming a so-called neutrino background. Variations in density across the universe, caused by the lumpy matter in the fireball of the big bang, would have created ripples in this background.
Roberto Trotta of the University of Oxford and Alessandro Melchiorri of…
