Neutrinos and the Universe

TL;DR

This paper reviews the role of neutrinos, including sterile neutrinos and CPT violation, in early universe physics, focusing on leptogenesis, baryogenesis, and dark matter, highlighting their potential impact on cosmology.

Contribution

It provides a comprehensive overview of how neutrinos could influence early universe phenomena, emphasizing new mechanisms involving sterile neutrinos and CPT violation.

Findings

Sterile neutrinos may play a key role in leptogenesis and baryogenesis.

CPT violation among active neutrinos could explain matter-antimatter asymmetry.

Neutrinos might be connected to the dark sector of the Universe.

Abstract

In this talk, I review the potential connection of neutrinos to the Physics of the Early Universe, in particular the r\^ole of (sterile) neutrinos to leptogenesis/baryogenesis and the dark sector of the Universe. The possibility of CPT Violation among active neutrinos at early times and its role in leptogenesis/baryogenesis without sterile neutrinos is also touched upon.