Axion Theory and Lattice QCD: Advances and Challenges

Contribution List

1. Non-perturbative QCD inputs for axion phenomenology: status and perspectives

Dr Claudio Bonanno (U. Bern)

4/8/26, 2:00 PM

I will review the current state of affairs concerning non-perturbative QCD inputs for axion phenomenology. I will provide a systematic survey of existing lattice QCD results, and I will outline how they compare with up-to-date predictions coming from chiral effective theories and semiclassics. I will conclude delineating the future challenges that await this field in the near future, and what...

2. Thermal Production of QCD Axions from the Early Universe

Alessio Notari (Universitat de Barcelona), Alessio Notari (Istituto Nazionale di Fisica Nucleare)

4/8/26, 3:25 PM

A population of thermally produced QCD axions from the early universe is expected to exist, in addition to a cold dark matter population. I discuss axion production from scattering with pions, including momentum dependence. I will show that to exploit the reach of current and upcoming cosmological surveys, non-perturbative calculations around and above the QCD crossover are needed. I will...

3. QCD axion at the QCD scale?

Luca Di Luzio (Istituto Nazionale di Fisica Nucleare)

4/8/26, 4:15 PM

In a recent paper, Murayama proposed a GeV-scale axion scenario in which the up-quark mass arises dynamically from the QCD chiral condensate, which at the same time spontaneously breaks a Peccei–Quinn symmetry. If correct, this striking idea would imply that the QCD axion has effectively already been discovered and is hidden among the known pseudoscalar resonances in the 1–2 GeV region. The...

4. Discussion Session

4/8/26, 5:05 PM