Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique
Non-Gaussianity constraints using future radio continuum surveys and the multitracer technique
复制标题
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:
影响因子:
--
通讯作者:
J. Fonseca
中科院分区:
文献类型:
--
作者:
Zahra Gomes;S. Camera;M. Jarvis;C. Hale;J. Fonseca
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.
影响因子:
4.8
作者:
Almosallam, Ibrahim A.;Jarvis, Matt J.;Roberts, Stephen J.
通讯作者:
Roberts, Stephen J.
影响因子:
6.4
作者:
E. Castorina;N. Hand;U. Seljak;F. Beutler;C. Chuang;Cheng Zhao;H. Gil-Mar'in;W. Percival;A. R
通讯作者:
E. Castorina;N. Hand;U. Seljak;F. Beutler;C. Chuang;Cheng Zhao;H. Gil-Mar'in;W. Percival;A. R
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