Francesco D'Eramo: "Thermal Axions: Production Mechanisms and Cosmological Signals"

Name: Francesco D'Eramo: "Thermal Axions: Production Mechanisms and Cosmological Signals"
Start: 2022-06-02T11:00:00+02:00
End: 2022-06-02T12:00:00+02:00
Location: Zoom

Thursday 2 Jun 2022, 11:00 → 12:00 Europe/Ljubljana

https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09 (Zoom)

https://zoom.us/j/3601731049?pwd=bVNQRjUxU2ExZ0cveWcxYXNUUGdjZz09

Zoom

Description

Scattering and decay processes of thermal bath particles in the early universe can dump relativistic axions in the primordial plasma. If produced with a significant abundance, their presence can leave observable signatures in cosmological observables probing both the early and the late universe. In this talk, I will focus on the QCD axion and I will present recent and significant improvements for the calculation of the axion production rate across the different energy scales during the expansion of the universe. I will apply these rates to predict the abundance of produced axions, and I will present the latest cosmological bounds on the axion mass and couplings.