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Understanding the origin of matter in the universe: the neutrino approach

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Despite no clear signs of new physics at colliders, neutrino masses and the matter content of the universe require an extension of our current established description of the fundamental laws of physics. Extensions of the Standard Model able to address simultaneously neutrino masses and mixing parameters and the problem of the origin of matter of the universe, both the matter-antimatter asymmetry and the existence of a (non-baryonic) dark matter component, are quite attractive and can moreover be embedded within well motivated models such as grand unified theories and/or flavour models. In the talk I will give an overview of models of the origin of matter in the universe relying on the existence of right-handed neutrinos and on minimal seesaw mechanism. I will also show how these extensions might give rise to signatures in ultra-high energy neutrino flux, stochastic GW backgrounds and also potentially address current cosmological tensions such as the Hubble (constant) tension.

This talk is part of the Cosmology Lunch series.

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