Recent progress on QCD inputs for axion phenomenology

Abstract

The properties of the QCD axion are strictly related to the dependence of strong interactions on the topological parameter theta. We present a determination of the topological properties of QCD for temperatures up to around 600 MeV, obtained by lattice QCD simulations with 2+1 flavors and physical quark masses. Numerical results for the topological susceptibility, when compared to instanton gas computations, differ both in size and in the temperature dependence. We discuss the implications of such findings for axion phenomenology, also in comparison to similar studies in the literature, and the prospects for future investigations.

Invited talk at XII Quark Confinement, 29 August - 3 September, 2016, Thessaloniki, Greece, 9 pages, 6 figures

References in corpus (9)

• The QCD equation of state with dynamical quarks
• The QCD transition temperature: results with physical masses in the continuum limit
• The QCD transition temperature: results with physical masses in the continuum limit II.
• Critical slowing down and error analysis in lattice QCD simulations
• The topological susceptibility in finite temperature QCD and axion cosmology
• Lattice QCD for Cosmology
• Topological susceptibility in finite temperature (2+1)-flavor QCD using gradient flow
• $\theta$ dependence of 4D $SU(N)$ gauge theories in the large-$N$ limit
• Comparison of different lattice definitions of the topological charge

Cited by in corpus (10)

• The dark-matter axion mass
• Primordial Black Holes from the QCD axion
• Operation of a ferromagnetic axion haloscope at $m_a=58\mu$eV
• Axions, Instantons, and the Lattice
• Comments on Axions, Domain Walls, and Cosmic Strings
• Magnon-driven dynamics of a hybrid system excited with ultrafast optical pulses
• Resonant excitation of the axion field during the QCD phase transition
• Axion dark matter and the Lattice
• Theta dependence of the vacuum energy density in chiral effective Lagrangian models at finite temperature, above $T_c$
• Remarks on the Debye Length and the Topological Susceptibilty in Non-Abelian Gauge Theory