Neutrino Properties with Ground-based Millimeter-wavelength Line Intensity Mapping
Neutrino Properties with Ground-based Millimeter-wavelength Line Intensity Mapping
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DOI：
10.3847/1538-4357/ac3edd
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发表时间：
2021-09
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通讯作者：
Azadeh Moradinezhad Dizgah;G. Keating;K. Karkare;A. Crites;Shouvik Roy Choudhury
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作者：
Azadeh Moradinezhad Dizgah;G. Keating;K. Karkare;A. Crites;Shouvik Roy Choudhury
线强度映射（LIM）是一种新兴的强大的技术来映射宇宙的大尺度结构和探索宇宙学在广泛的红移和空间尺度。我们进行Fisher预测，以确定宽场地基毫米波长LIM调查的最佳设计，以约束中微子和光遗迹的属性。我们考虑在红移0.25 < z < 12的范围内测量几条CO转动线（从J = 2-1到J = 6-5）和[C ii]精细结构线的自功率谱。在我们的分析中，我们研究了有和没有插入线作为噪声源的约束，以及ΛCDM的几个单参数和多参数扩展。我们表明，LIM调查部署这十年，与现有的宇宙微波背景（CMB;主要）数据相结合，可以实现数量级的改善普朗克约束的Neff和M ν。与下一代CMB和星系巡天相比，这种规模的LIM实验可以实现比欧几里得（星系聚类）等巡天预测的界限好1.3倍的界限，并且可能超过CMB-S4的约束能力，分别为Neff和M ν的1.5倍和1.3倍。我们表明，预测的约束条件没有受到很大的影响时，扩大参数空间，并进一步表明，这样的调查也可以用来测量ΛCDM参数和暗能量状态方程精美好。
Line intensity mapping (LIM) is emerging as a powerful technique to map the cosmic large-scale structure and to probe cosmology over a wide range of redshifts and spatial scales. We perform Fisher forecasts to determine the optimal design of wide-field ground-based millimeter-wavelength LIM surveys for constraining properties of neutrinos and light relics. We consider measuring the auto-power spectra of several CO rotational lines (from J = 2–1 to J = 6–5) and the [C ii] fine-structure line in the redshift range of 0.25 < z < 12. We study the constraints with and without interloper lines as a source of noise in our analysis, and for several one-parameter and multiparameter extensions of ΛCDM. We show that LIM surveys deployable this decade, in combination with existing cosmic microwave background (CMB; primary) data, could achieve order-of-magnitude improvements over Planck constraints on N eff and M ν . Compared to next-generation CMB and galaxy surveys, a LIM experiment of this scale could achieve bounds that are a factor of ∼3 better than those forecasted for surveys such as EUCLID (galaxy clustering), and potentially exceed the constraining power of CMB-S4 by a factor of ∼1.5 and ∼3 for N eff and M ν , respectively. We show that the forecasted constraints are not substantially affected when enlarging the parameter space, and additionally demonstrate that such a survey could also be used to measure ΛCDM parameters and the dark energy equation of state exquisitely well.