Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique

Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique
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使用未来无线电连续统勘测和多示踪技术的非高斯约束

DOI:
10.1093/mnras/stz3581
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发表时间:
2019
期刊:
arXiv: Cosmology and Nongalactic Astrophysics
影响因子:
--
通讯作者:
J. Fonseca
J. Fonseca
中科院分区:
--
文献类型:
--
作者:
Zahra Gomes;S. Camera;M. Jarvis;C. Hale;J. Fonseca

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对原始非高斯性测量的更严格限制将允许区分通货膨胀情景。宇宙微波背景双谱——测量局部非高斯性的标准方法——受到宇宙方差的限制。因此,利用大尺度结构研究非高斯性的测量是明智的。这可以通过大范围研究非高斯性对功率谱的影响来完成。在本研究中,我们预测了可以通过未来无线电勘测获得的局部原始非高斯参数 $f_{\rm NL}$ 的约束。我们利用多示踪剂方法,减少宇宙方差的影响,并利用多个射电星系群体,这些射电星系群体是相同底层暗物质分布的不同偏差的示踪剂。对之前工作的改进包括使用观测偏差和晕质量估计、更新的模拟和现实的光度红移预期,从而产生更现实的预测。使用了 SKA 模拟和射电观测的组合以及不同的红移范围和红移箱大小。结果发现,在最现实的情况下,$f_{\rm NL}$ 上的 1 - $\sigma$ 误差落在 4.07 和 6.58 范围内,与当前可用的最严格约束相媲美。
Tighter constraints on measurements of primordial non-Gaussianity will allow the differentiation of inflationary scenarios. The cosmic microwave background bispectrum-the standard method of measuring the local non-Gaussianity-is limited by cosmic variance. Therefore, it is sensible to investigate measurements of non-Gaussianity using the large-scale structure. This can be done by investigating the effects of non-Gaussianity on the power spectrum on large scales. In this study we forecast the constraints on the local primordial non-Gaussianity parameter $f_{\rm NL}$ that can be obtained with future radio surveys. We utilize the multi-tracer method which reduces the effect of cosmic variance and takes advantage of the multiple radio galaxy populations which are differently biased tracers of the same underlying dark matter distribution. Improvements on previous work include the use of observational bias and halo mass estimates, updated simulations and realistic photometric redshift expectations, thus producing more realistic forecasts. Combinations of SKA simulations and radio observations were used as well as different redshift ranges and redshift bin sizes. It was found that in the most realistic case the 1 - $\sigma$ error on $f_{\rm NL}$ falls within the range 4.07 and 6.58, rivalling the tightest constraints currently available.
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影响因子: 4.8
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DOI: 10.48550/arxiv.1308.4725
发表时间: 2013
期刊: --
影响因子: --
作者:
Almeida C
通讯作者: Almeida C