当前位置: X-MOL 学术J. Cosmol. Astropart. Phys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Neutrino mass constraints beyond linear order: cosmology dependence and systematic biases
Journal of Cosmology and Astroparticle Physics ( IF 6.4 ) Pub Date : 2021-04-09 , DOI: 10.1088/1475-7516/2021/04/022
Aoife Boyle 1, 2 , Fabian Schmidt 1
Affiliation  

We demonstrate the impact on forecasted neutrino mass constraints of improving galaxy clustering and CMB lensing predictions from linear to next-to-leading-order power spectra. The redshift-space 1-loop power spectrum model we adopt requires an additional four free bias parameters, a velocity bias parameter and two new stochastic parameters. These additional nuisance parameters appreciably weaken the constraints on M ν . CMB lensing plays a significant role in helping to alleviate these degeneracies and tighten the final constraints. The constraint on the optical depth to reionisation τ has a strong effect on the constraint on M ν , but only when CMB lensing is included in the analysis to keep the degeneracies with the nuisance parameters under control. We also extract constraints when 1) using the BAO signature only as a distance probe, and 2) isolating the scale-dependence of the power spectrum, which, as shown in previous work, provides a cosmology-independent probe of M ν . All constraints except the latter remain strongly sensitive to the assumption of a flat ΛCDM universe. We perform an analysis of the magnitude of the shift introduced in the inferred M ν value when neglecting nonlinear corrections, and show that, for a Euclid-like survey, this shift becomes roughly equal to the 1σ constraint itself even with a conservative cut-off scale of k max = 0.1 hMpc-1. We also perform a calculation of the approximate expected bias in neutrino mass caused by not including the next, 2-loop order and expect a shift of only about 20% of the 1σ error for k max = 0.2hMpc-1 in a Euclid-like survey.



中文翻译:

超出线性顺序的中微子质量约束:宇宙学依赖性和系统偏差

我们展示了改进星系聚类和 CMB 透镜预测从线性到次领先阶功率谱对预测中微子质量约束的影响。我们采用的红移空间 1 环功率谱模型需要额外的四个自由偏置参数、一个速度偏置参数和两个新的随机参数。这些额外的干扰参数明显削弱了对M ν的约束。CMB 透镜在帮助缓解这些退化和收紧最终约束方面发挥着重要作用。对再电离 τ 的光学深度的约束对M ν的约束有很大的影响 ,但只有当 CMB 透镜包含在分析中以控制带有讨厌参数的简并时。当 1) 仅将 BAO 签名用作距离探针,以及 2) 隔离功率谱的尺度依赖性时,我们还提取了约束,如之前的工作所示,它提供了M ν的与宇宙学无关的探针。除后者之外的所有约束对平坦 ΛCDM 宇宙的假设仍然非常敏感。当忽略非线性校正时,我们对推断的M ν值中引入的偏移量进行了分析,并表明,对于类似欧几里德的调查,即使使用保守的截止值,这种偏移也大致等于 1σ 约束本身k max的尺度 = 0.1 hMpc -1。我们还计算了由于不包括下一个 2 环阶而导致的中微子质量的近似预期偏差,并期望在类欧几里德中k max = 0.2hMpc -1的 1σ 误差仅移动约 20%民意调查。

更新日期:2021-04-09
down
wechat
bug