Résumé / Abstract Journal-club_Univers

Journal-club Univers / Journal-club Universe

« Neutrino dynamics in big bang nucleosynthesis »

Evan Grohs
Dept. Astron., Univ. California (Berkeley, California, Etats-Unis d'Amérique)

The laboratory of the early universe provides a setting for testing Beyond Standard Model (BSM) physics in the particle and cosmological sectors. Any BSM physics in operation at early times may produce slight deviations in the primordial element abundances and cosmic microwave background observables predicted within the standard cosmology. The identification and characterization of such BSM signatures require a precise numerical treatment of the neutrino energy and flavor wave functions when the neutrinos decouple from the electromagnetic plasma. This weak decoupling process occurs during Big Bang Nucleosynthesis (BBN) and we employ Quantum Kinetic Equations (QKEs) to follow the out-of-equilibrium neutrino evolution. I will give an overview on the role neutrinos play in BBN, as well as give an introduction to the full QKE problem with neutrino oscillations and collisions. A QKE treatment of early-universe neutrino physics will greatly assist observers and theorists as the next-generation-cosmological experiments come on line in the near future.
mardi 17 septembre 2019 - 11:15
Salle 281, Institut d'Astrophysique
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