Axion dark matter and the Lattice

Abstract

First I will review the QCD theta problem and the Peccei-Quinn solution, with its new particle, the axion. I will review the possibility of the axion as dark matter. If PQ symmetry was restored at some point in the hot early Universe, it should be possible to make a definite prediction for the axion mass if it constitutes the Dark Matter. I will describe progress on one issue needed to make this prediction -- the dynamics of axionic string-wall networks and how they produce axions. Then I will discuss the sensitivity of the calculation to the high temperature QCD topological susceptibility. My emphasis is on what temperature range is important, and what level of precision is needed.

18 pages with 9 figures, plenary talk at conference "Lattice 2017" (Granada, Spain)

References in corpus (2)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Axion cold dark matter in view of BICEP2 results

Cited by in corpus (10)

• The art of simulating the early Universe -- Part I
• Radiation from Global Topological Strings using Adaptive Mesh Refinement: Methodology and Massless Modes
• Topological susceptibility and ${\eta }^{\prime }$ meson mass from $N_f=2$ lattice QCD at the physical point
• Topological susceptibility in finite temperature QCD with physical $(u/d,s,c)$ domain-wall quarks
• Present and future of CosmoLattice
• Open-Boundary Conditions in the Deconfined Phase
• Temperature-dependence of the QCD topological susceptibility
• Multicanonical reweighting for the QCD topological susceptibility
• $\mathcal{H}$olographic $\mathcal{N}$aturalness and Information See-Saw Mechanism for Neutrinos
• Estimating ${\chi }_{\mathrm{top}}$ Lattice Artifacts from Flowed SU(2) Calorons