Speaker
Stefano Gariazzo
(INFN Torino)
Description
In this talk I review the meaning of cosmological bounds on two important quantities, the effective number of relativistic species Neff and the sum of neutrino masses, and their relation with fundamental neutrino properties. I discuss several non-standard scenarios where Neff can be significantly altered (much larger or much smaller than 3), and also scenarios which barely change its value. Concerning the sum of neutrino masses, I will show how it is possible to avoid cosmological bounds with neutrino decay or time-dependent masses, in order to reconcile cosmological observations with neutrino oscillation constraints.
Primary author
Stefano Gariazzo
(INFN Torino)
