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arXiv 2412.04071astro-ph.CO
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利用线强度映射实现多示踪中微子质量测量

Towards a multi-tracer neutrino mass measurement with line-intensity mapping

Gali Shmueli, Sarah Libanore, Ely D. Kovetz

AI总结:

本研究探索利用线强度映射(LIM)结合速度层析成像等多示踪分析,并联合CMB-S4和DESI-BAO数据,在未来实现中微子质量总和的高灵敏度(~18-50 meV)测量与高显著性(>5σ)检测。

摘要:

准确测定中微子质量是当代宇宙学的主要目标。由于大质量中微子影响结构的形成与演化,对大尺度结构的探测对其质量总和敏感。在本研究中,我们利用线强度映射(LIM)作为探测宇宙密度的一种有前景的新兴手段,探索未来对 $\sum m_ν$ 的限制,以精细结构 [CII] 线为例,并将这些限制与通过传统星系巡天得出的限制进行比较。此外,我们通过运动学 Sunyaev-Zeldovich 效应和运动透镜效应,利用速度层析成像进行多示踪分析,以重建三维速度场。我们的预测表明,下一代 AtLAST 探测器自身能实现 $σ_{Σm_ν} \sim 50$ meV 的灵敏度。速度层析成像将进一步将这些限制改善 4%。在综合多示踪分析中纳入 CMB-S4 和 DESI-BAO 的预测,同时设定基于 21-cm 预测观测推导出的再电离光学深度 $τ$ 先验以打破简并性,我们发现,在正常层级下,利用 LIM 实现 $\sum m_ν\\!\sim\\!60$ meV 的 $\gtrsim5σ$ 检测是触手可及的。即使没有 $τ$ 先验,我们的综合预测也能达到 $σ_{Σm_ν} \\!\sim\\! 18$ meV。

英文摘要:

Accurately determining neutrino masses is a main objective of contemporary cosmology. Since massive neutrinos affect structure formation and evolution, probes of large scale structure are sensitive to the sum of their masses. In this work, we explore future constraints on $\sum m_ν$ utilizing line-intensity mapping (LIM) as a promising emerging probe of the density of our Universe, focusing on the fine-structure [CII] line as an example, and compare these constraints with those derived from traditional galaxy surveys. Additionally, we perform a multi-tracer analysis using velocity tomography via the kinetic Sunyaev-Zeldovich and moving lens effects to reconstruct the three-dimensional velocity field. Our forecasts indicate that the next-generation AtLAST detector by itself can achieve $σ_{Σm_ν} \sim 50$ meV sensitivity. Velocity tomography will further improve these constraints by 4%. Incorporating forecasts for CMB-S4 and DESI-BAO in a comprehensive multi-tracer analysis, while setting a prior on the optical depth to reionization $τ$ derived using 21-cm forecasted observations, to break degeneracies, we find that a $\gtrsim5σ$ detection of $\sum m_ν\!\sim\! 60$ meV, under the normal hierarchy, is within reach with LIM. Even without a $τ$ prior, our combined forecast reaches $σ_{Σm_ν} \!\sim\! 18$ meV.

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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