Stefano Gariazzo

Light sterile neutrinos

The theory and phenomenology of light sterile neutrinos at the eV mass scale is reviewed. The reactor, Gallium and LSND anomalies are briefly described and interpreted as indications of the existence of short-baseline oscillations which require the existence of light sterile neutrinos. The global fits of short-baseline oscillation data in 3+1 and 3+2 schemes are discussed, together with the implications for beta-decay and neutrinoless double-beta decay. The cosmological effects of light sterile neutrinos are briefly reviewed and the implications of existing cosmological data are discussed. The review concludes with a summary of future perspectives.

Light sterile neutrinos after BICEP-2

The recent discovery of B-modes in the polarization pattern of the Cosmic Microwave Background by the BICEP2 experiment has important implications for neutrino physics. We revisit cosmological bounds on light sterile neutrinos and show that they are compatible with all current cosmological data provided that the mass is relatively low. Using CMB data, including BICEP-2, we find an upper bound of ms 10). However, if the sterile neutrino only partly thermalises it can be compatible with all current data, both cosmological and terrestrial.

Updated global 3+1 analysis of short-baseline neutrino oscillations

A bstractWe present the results of an updated fit of short-baseline neutrino oscillation data in the framework of 3+1 active-sterile neutrino mixing. We first consider νe and ν¯e

Pseudoscalar—sterile neutrino interactions: reconciling the cosmos with neutrino oscillations

{\overline{\nu}}_e

Dark Radiation and Inflationary Freedom after Planck 2015

disappearance in the light of the Gallium and reactor anomalies. We discuss the implications of the recent measurement of the reactor ν¯e

Calculation of the local density of relic neutrinos

{\overline{\nu}}_e