Speaker
Rasmus Sloth Lundkvist Hansen
(Niels Bohr Institute)
Description
Collective neutrino oscillations are known to amplify anisotropies and inhomogeneities for supernova neutrinos. In this talk, I will consider neutrino oscillations in the early Universe, assumed to be almost perfectly isotropic and homogeneous. However, collective oscillations can, also in this case, amplify a small initial anisotropy by many orders of magnitude. This will be demonstrated in a simple model by performing a linear stability analysis as well as a full numerical solution, and the effect on the effective number of neutrinos will be discussed.
Primary author
Rasmus Sloth Lundkvist Hansen
(Niels Bohr Institute)