Lattice QCD and Axion Cosmology
Evan Berkowitz
TL;DR
This paper discusses how lattice QCD calculations of topological susceptibility inform axion cosmology, particularly regarding the axion's mass and role as dark matter.
Contribution
It provides new nonperturbative QCD results for topological susceptibility relevant to axion cosmology.
Findings
Pure-glue lattice QCD calculations of topological susceptibility
Implications for axion mass and coupling constants
Enhanced understanding of axion's role as dark matter
Abstract
The Strong CP Problem can be resolved by introducing an additional global symmetry known as Peccei-Quinn symmetry. Once PQ symmetry is broken the associated particle, the QCD axion, is a plausible dark matter candidate. Calculating the cosmological energy density of the axion requires nonperturbative QCD input---the high-temperature topological susceptibility. I will show results from a pure-glue calculation and examine the implications for the axion mass and coupling.
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Cosmology and Gravitation Theories · Particle physics theoretical and experimental studies