The topological susceptibility in finite temperature QCD and axion cosmology

By P. Petreczky, H. Schadler, Sayantan Sharma. 2016

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Abstract We study the topological susceptibility in 2 + 1 flavor QCD above the chiral crossover transition temperature using Highly Improved Staggered Quark action and several lattice spacings corresponding to temporal extent of the lattice, N τ = 6 , 8 , 10 and 12. We observe very distinct temperature dependences of the topological susceptibility in the ranges above and below 250 MeV . While for temperatures above 250 MeV , the dependence is found to be consistent with dilute instanton gas approximation, at lower temperatures the fall-off of topological susceptibility is milder. We discuss the consequence of our results for cosmology wherein we estimate the bounds on the axion decay constant and the oscillation temperature if indeed the QCD axion is a possible dark matter candidate.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0290582df43fd3e608e3acfe5b71de9913d89deb

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Citations in the corpus

Standard Model—axion—seesaw—Higgs portal inflation. Five problems of particle physics and cosmology solved in one stroke (2016, methodology): “A previous lattice calculation, which predicted a much softer slope [173], was most probably suffering from strong cut-off effects [39, 168].”
Physics potential of the International Axion Observatory (IAXO) (2019, background): “Such a result might be interpreted as huge lattice artifacts caused by strong cutoff effects [86, 91].”
More axions from strings (2020, background): “where, as suggested by the dilute instanton gas approximation [37] and supported by recent lattice simulations [38–42] (see also ref.”
The landscape of QCD axion models (2020, background): “In particular several groups have carried out dedicated QCD simulations on the lattice in ranges of temperature relevant for the axion mass [126, 164, 167–169].”