Neutrino and Dark Radiation properties in light of recent CMB observations
by
Maria Archidiacono(Aarhus University)
→
Europe/Berlin
Building 67, SemRm 10 (DESY Hamburg)
Building 67, SemRm 10
DESY Hamburg
Description
Neutrinos deeply affect the cosmological observables, such as the Cosmic
Microwave Background and the power spectrum of matter fluctuations. Thanks to these fingerprints cosmology can constrain the absolute neutrino mass scale and the cosmic neutrino background.
In the past years cosmology has also provided some hints for a non
standard value of the effective number of relativistic degrees of freedom, pointing towards the existence of an extra dark component of the radiation content of the Universe.
In my talk I will review recent cosmological constraints on neutrino and dark
radiation properties. Indeed recent CMB measurements at high multipoles
from the South Pole Telescope and from the Atacama Cosmology Telescope seem to disagree in their conclusions for the neutrino and dark radiation properties. I will discuss how this tension can be alleviated by adding external data sets or extending the cosmological model.
Finally I will interpret the Planck results concerning neutrino and dark
radiation properties in light of these considerations.