arXiv 2108.048272021-08astro-ph.COastro-ph.HEhep-ph

由X射线观测更新类轴子粒子的边界

Updated Bounds on Axion-Like Particles from X-ray Observations

Simon Schallmoser, Sven Krippendorf, Francesca Chadha-Day, Jochen Weller

备注：: v2: minor changes, 14 pages, 7 figures, 11 tables; matches accepted version to appear in MNRAS
DOI：: 10.1093/mnras/stac1224

摘要：

在这项工作中，我们重新访问五个不同的点源内或背后的星系团，以限制耦合常数之间的轴子粒子（ALP）和光子。我们使用三种不同的机器学习（ML）技术，并将我们的结果与标准的$χ^2$分析进行比较。这是我们第一次将近似贝叶斯计算应用于搜索ALP，并在ML分类器中发现了一致的良好性能。此外，我们应用更逼真的三维磁场模拟的星系团，并比较我们的结果与以前使用的一维模拟。我们发现ALP-光子耦合的约束在国家的最先进的水平与$g_{aγγ} \lesssim 0.6 \times 10^{-12}$ GeV ${}^{-1}$的界限，从而改善以前的约束从相同的观察。

英文摘要：

In this work we revisit five different point sources within or behind galaxy clusters in order to constrain the coupling constant between axion-like particles (ALPs) and photons. We use three distinct machine learning (ML) techniques and compare our results with a standard $χ^2$ analysis. For the first time we apply approximate Bayesian computation to searches for ALPs and find consistently good performance across ML classifiers. Further, we apply more realistic 3D magnetic field simulations of galaxy clusters and compare our results with previously used 1D simulations. We find constraints on the ALP-photon coupling at the level of state-of-the-art bounds with $g_{aγγ} \lesssim 0.6 \times 10^{-12}$ GeV${}^{-1}$, hence improving on previous constraints obtained from the same observations.

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