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arXiv 2103.08674astro-ph.COhep-ph
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用星系团计数约束超轻轴子

Constraining Ultra-light Axions with Galaxy Cluster Number Counts

Johannes Diehl, Jochen Weller

摘要:

在本文中,我们调查的潜力,目前和即将到来的宇宙学调查约束的质量和丰度的超轻轴子(轴子)宇宙学与星系团数计数。ULA,有时也被称为模糊暗物质,在标准模型之外的许多理论中都有很好的动机,并且可能解决$Λ$ CDM小规模危机。星系团计数为宇宙结构的形成提供了一个强有力的探测。它们的质量和红移分布对基本的线性物质扰动非常敏感。在这篇预测论文中,我们探讨了两种情况,首先是一个排斥限制轴子质量给出了一个无轴子模型,其次是约束的轴子模型。由此我们得到了$m_a \gtrsim 10^{-24}$ eV量级的电子质量下限。然而,这一结果在很大程度上取决于给定调查中最小的可靠可观测集群的质量。像许多其他宇宙学探测器一样,星团计数在质量与丰度参数空间中显示出近似的简并性,这取决于探测器的特性。这些简并对于其他宇宙学探测器是不同的。因此,星系团的计数可能会提供一个补充窗口的性质超轻轴子。

英文摘要:

In this paper we investigate the potential of current and upcoming cosmological surveys to constrain the mass and abundance of ultra-light axion (ULA) cosmologies with galaxy cluster number counts. ULAs, sometimes also referred to as Fuzzy Dark Matter, are well-motivated in many theories beyond the Standard Model and could potentially solve the $Λ$CDM small-scale crisis. Galaxy cluster counts provide a robust probe of the formation of structures in the Universe. Their distribution in mass and redshift is strongly sensitive to the underlying linear matter perturbations. In this forecast paper we explore two scenarios, firstly an exclusion limit on axion mass given a no-axion model and secondly constraints on an axion model. With this we obtain lower limits on the ULA mass on the order of $m_a \gtrsim 10^{-24}$ eV. However, this result depends heavily on the mass of the smallest reliably observable clusters for a given survey. Cluster counts, like many other cosmological probes, display an approximate degeneracy in the ULA mass vs. abundance parameter space, which is dependent on the characteristics of the probe. These degeneracies are different for other cosmological probes. Hence galaxy cluster counts might provide a complementary window on the properties of ultra-light axions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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