Speaker: Julia Gehrlein

Abstract: Correlations between light neutrino observables are common predictions of a large class of models based on the (discrete) symmetry approach to lepton flavour. Neutrino mass sum rules connect the three (complex) light neutrino mass eigenvalues among each other and mixing sum rules relate the leptonic mixing angles and the Dirac phase. However, in nearly all cases known, the sum rules are not exact and receive corrections from various sources. We will discuss generic corrections to these sum rules which arise for example from higher dimensional operators or renormalisation group evolution and present the effect of the corrections on the predictions from sum rules found in the literature. While in most cases the predictions of mass sum rules are fairly stable running effects for the mixing sum rules have to be taken into account to realistically probe the predictions from the sum rules in concrete models.