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arXiv 1706.09462astro-ph.CO
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非标准暗能量和暗物质模型在21厘米强度图功率谱上的印记

Imprints of non-standard Dark Energy and Dark Matter Models on the 21cm Intensity Map Power Spectrum

Isabella P. Carucci, Pier-Stefano Corasaniti, Matteo Viel

摘要:

研究了非标准暗能量(DE)和暗物质(DM)模型对高红移中性氢(HI)气体21 cm强度谱图功率谱的影响。为此,我们使用晕目录从N体模拟的动态DE模型和DM的情况下,统计上无法区分的标准冷暗物质模型与宇宙学常数(LCDM),使用目前可用的宇宙学观测。我们限制我们的分析晕目录在红移z = 1和2.3,这是共同的所有模拟。对于每个目录,我们使用一个简单的处方相关联的HI气体质量N体晕的HI分布模型。我们发现,DE模型留下一个独特的签名在HI光谱在很宽的范围内的尺度,这与晕质量函数和非线性制度的聚类发病的差异。在非标准DM模型的情况下,HI谱相对于LCDM模型的显着差异只产生于低质量晕的抑制丰度。这些宇宙学模型相关的特征也出现在21厘米光谱中。特别是,我们发现,未来的SKA测量可以区分DE和DM模型的印记在高统计显著性。

英文摘要:

We study the imprint of non-standard dark energy (DE) and dark matter (DM) models on the 21cm intensity map power spectra from high-redshift neutral hydrogen (HI) gas. To this purpose we use halo catalogs from N-body simulations of dynamical DE models and DM scenarios which are statistically indistinguishable from the standard Cold Dark Matter model with Cosmological Constant (LCDM) using currently available cosmological observations. We limit our analysis to halo catalogs at redshift z = 1 and 2.3 which are common to all simulations. For each catalog we model the HI distribution by using a simple prescription to associate the HI gas mass to N-body halos. We find that the DE models leave a distinct signature on the HI spectra across a wide range of scales, which correlates with differences in the halo mass function and the onset of the non-linear regime of clustering. In the case of the non-standard DM model significant differences of the HI spectra with respect to the LCDM model only arise from the suppressed abundance of low mass halos. These cosmological model dependent features also appear in the 21cm spectra. In particular, we find that future SKA measurements can distinguish the imprints of DE and DM models at high statistical significance.

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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