The topological susceptibility in finite temperature QCD and axion cosmology

被引：128

作者：

Petreczky, Peter ^{[1
]}

Schadler, Hans-Peter ^{[1
]}

Sharma, Sayantan ^{[1
]}

机构：

[1] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

PHYSICS LETTERS B | 2016年 / 762卷

关键词：

CHIRAL FERMIONS; CP CONSERVATION; GAUGE-THEORY; INSTANTONS; MASSES;

D O I：

10.1016/j.physletb.2016.09.063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the topological susceptibility in 2 + 1flavor 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, 10and 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. (C) 2016 The Authors. Published by Elsevier B.V.

引用

页码：498 / 505

页数：8

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