IFIC Topical Seminar: Neutrinos from Primordial Black Holes, an opera in two acts

por Yuber F. Pérez-González (Institute for Particle Physics Phenomenology, Durham University)

jueves 18 nov. 2021 15:00 → 16:00 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

Hawking radiation offers a unique method of neutrino production, unlike any weak interaction process. Moreover, black hole evaporation depends on whether neutrinos are Dirac or Majorana, providing a different phenomenology in each case. If neutrinos are Dirac particles, the emission of the light right-handed states does not suffer from the helicity suppression present in weak interactions. Hence, it is possible to have a significant fraction of such states as relics from the Early Universe. On the other hand, if neutrinos are Majorana, heavy right-handed states like those appearing in the seesaw mechanism can be produced by a black hole, altering thermal leptogenesis and thus the baryon asymmetry. In this talk, we will explore these two different possibilities.