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High Energy Physics - Lattice

arXiv:1606.03145 (hep-lat)
[Submitted on 9 Jun 2016 (v1), last revised 23 Nov 2016 (this version, v2)]

Title:The topological susceptibility in finite temperature QCD and axion cosmology

Authors:Peter Petreczky, Hans-Peter Schadler, Sayantan Sharma
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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, $N_\tau=6,8,10$ 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.
Comments: 19 pages and 7 figures; v2: A new figure, a few references and minor comments added; published version
Subjects: High Energy Physics - Lattice (hep-lat); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:1606.03145 [hep-lat]
  (or arXiv:1606.03145v2 [hep-lat] for this version)
  https://doi.org/10.48550/arXiv.1606.03145
Journal reference: Phys.Lett. B762 (2016) 498-505
Related DOI: https://doi.org/10.1016/j.physletb.2016.09.063

Submission history

From: Sayantan Sharma [view email]
[v1] Thu, 9 Jun 2016 23:50:14 UTC (288 KB)
[v2] Wed, 23 Nov 2016 17:03:55 UTC (313 KB)
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