Seminari INFN

Pomeriggio sugli Assioni

Europe/Rome
Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

Aula Conversi

Dip. di Fisica - Edificio G. Marconi

Description

14.30  Axions in the Early Universe

Francesco D’Eramo (Padova University)

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.

 

15.15  Search for Axion Dark Matter

 

Claudio Gatti (LNF-INFN)

 

The axion, a pseudoscalar particle originally introduced to solve the ‘’strong CP problem’’, is a well motivated dark-matter candidate with a mass lying in a broad range from peV to few meV. Axions clustered inside our galaxy may be observed by means of detectors called “haloscopes” consisting in a resonant cavity immersed in a static magnetic field that triggers the axion conversion to microwave photons. Alternatively, axions could be produced in the lab, inside the core of the Sun or in intergalactic space producing a rich fenomenology.
The talk will review the status of galactic-axion searches, the prospects of future experiments and the efforts both in materials and quantum devices taken to improve the experimental sensitivity.
 

Organised by

Cardani, Esposito, Ippolito