Axion dark matter: strings and their cores

Abstract

Axions constitute a well-motivated dark matter candidate, and if PQ symmetry breaking occurred after inflation, it should be possible to make a clean prediction for the relation between the axion mass and the axion dark matter density. We show that axion (or other global) string networks in 3D have a network density that depends logarithmically on the string separation-to-core ratio. This logarithm would be about 10 times larger in axion cosmology than what we can achieve in numerical simulations. We simulate axion production in the early Universe, finding that, for the separation-to-core ratios we can achieve, the changing density of the network has little impact on the axion production efficiency.

23 pages plus appendices, 17 figures

References in corpus (8)

• Axion dark matter from topological defects
• Axion cosmology with long-lived domain walls
• Improved estimation of radiated axions from cosmological axionic strings
• Lattice QCD input for axion cosmology
• Axion cosmology, lattice QCD and the dilute instanton gas
• Axion cold dark matter in view of BICEP2 results
• Strongly broken Peccei-Quinn symmetry in the early Universe
• Diluting the inflationary axion fluctuation by a stronger QCD in the early Universe

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