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arXiv 2108.09563hep-phastro-ph.CO
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$N_\text{DW} = 1$ QCD轴子质量窗的拓扑缺陷统计解

Statistical Uncertainties of the $N_\text{DW} = 1$ QCD Axion Mass Window from Topological Defects

Sebastian Hoof, Jana Riess, David J. E. Marsh

备注：
15+3 pages, 11 figures. V3 corresponds to the version accepted in OJA
发表信息：
The Open Journal of Astrophysics 5 (2022)
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摘要：

我们回顾了QCD轴子弦和畴壁模拟的结果，并将相关的不确定性，包括QCD不确定性，传播到轴子遗迹密度的计算中。我们比较了两组不同的研究，并使用宇宙学的约束，进行统计推断后通货膨胀的Peccei-Quinn对称性破缺的情况下的轴子质量窗口。对于暗物质轴子在最近的模拟推断适度的红外主导的光谱，这导致一个中值暗物质轴子质量为0.50 meV，而95%的可信区间在最高的后验密度是0.48和0.52 meV之间。对于另外包括弦畴壁衰变的替代模拟（但对光谱具有不同的总体推断），这些数字为0.22 meV和[0.16，0.27] meV。放宽条件，所有的暗物质的轴子，轴子质量窗口完成的上限约为80 meV，这来自暗辐射的约束。这证实了轴子质量可以相当精确地限制统计不确定性，并进一步要求对模拟中系统不确定性的各种来源进行更详细的分析。

英文摘要：

We review results from QCD axion string and domain wall simulations and propagate the associated uncertainties, including QCD uncertainties, into the calculation of the axion relic density. We compare two different sets of studies and, using cosmological constraints, perform statistical inference on the axion mass window in the post-inflationary Peccei-Quinn symmetry breaking scenario. For dark matter axions in recent simulations inferring a moderately infrared-dominated spectrum, this leads to a median dark matter axion mass of 0.50 meV, while the 95% credible interval at highest posterior density is between 0.48 and 0.52 meV. For alternative simulations including in addition string-domain wall decays (but with different overall inference on the spectrum), these numbers are 0.22 meV and [0.16, 0.27] meV. Relaxing the condition that axions are all of the dark matter, the axion mass window is completed by an upper bound of around 80 meV, which comes from dark radiation constraints. This confirms that the axion mass can be constrained rather precisely regarding statistical uncertainties and further calls for a more detailed analysis of the various sources of systematic uncertainties plaguing the simulations.

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