Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

Thermal QCD axion production from the early universe

Jun 6, 2023, 2:45 PM
DAD - Room 0B (Genova, Italy)

DAD - Room 0B

Genova, Italy

Invited Hadrons and physics beyond the standard model Hadrons and physics beyond the standard model


Alessio Notari Alessio Notari (Universitat de Barcelona)


The axion is a hypothetical new particle that could explain the absence of CP violation in QCD and has a very rich cosmological phenomenology. In particular a population of thermally produced axions is expected to exist, in addition to a cold dark matter population. I discuss a new conservative bound on the axion mass, from production in the early universe through scattering with pions below the QCD phase transition. In addition I will show that to further improve the bound and exploit the reach of upcoming cosmological surveys, reliable non-perturbative calculations above the QCD crossover are needed.

Primary author

Alessio Notari (Universitat de Barcelona)

Presentation materials