Cosmological constraints from Fourier phase statistics

Cosmological constraints from Fourier phase statistics
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傅立叶相位统计的宇宙学约束

DOI:
10.1093/mnras/sty1696
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发表时间:
2018
影响因子:
4.8
通讯作者:
Ali K
Ali K
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ali K

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大多数宇宙大尺度结构的统计推断依赖于两点统计,即星系-星系相关函数(2PCF)或功率谱。这些统计捕获了编码在星系密度场傅立叶振幅中的全部信息,但没有描述该场的傅立叶相位。在这里,我们量化线相关函数(LCF)中包含的信息,这是一个三点傅立叶相位相关函数。通过宇宙学模拟,我们估计了2PCF、LCF及其组合的Fisher信息(在红移= 0时),涉及标准ΛCDM模型的宇宙学参数,以及暖暗物质模型和f(R)和symmetrn修正重力模型。星系偏差是在线性偏差的水平上考虑的。2PCF和LCF的相对信息取决于调查体积、采样密度(散粒噪声)和偏差不确定性。对于以平均密度点采样的体积,偏差不确定性为13%,LCF在ΛCDM宇宙学中将参数约束提高了约20%,在其他模型中可能会提高更多。最后,由于线性偏置只影响傅里叶振幅(2PCF),而不影响相位(LCF),所以2PCF和LCF的组合可以用来打破线性偏置和σ8之间的简并性,这存在于两点统计中。
Most statistical inference from cosmic large-scale structure relies on two-point statistics, i.e. on the galaxy–galaxy correlation function (2PCF) or the power spectrum. These statistics capture the full information encoded in the Fourier amplitudes of the galaxy density field but do not describe the Fourier phases of the field. Here, we quantify the information contained in the line correlation function (LCF), a three-point Fourier phase correlation function. Using cosmological simulations, we estimate the Fisher information (at redshift= 0) of the 2PCF, LCF, and their combination, regarding the cosmological parameters of the standard ΛCDM model, as well as a warm dark matter model and thef(R) and Symmetron-modified gravity models. The galaxy bias is accounted for at the level of a linear bias. The relative information of the 2PCF and the LCF depends on the survey volume, sampling density (shot noise), and the bias uncertainty. For a volume of, sampled with points of mean density, and a bias uncertainty of 13 per cent, the LCF improves the parameter constraints by about 20 per cent in the ΛCDM cosmology and potentially even more in alternative models. Finally, since a linear bias only affects the Fourier amplitudes (2PCF), but not the phases (LCF), the combination of the 2PCF and the LCF can be used to break the degeneracy between the linear bias and σ8, present in two-point statistics.
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发表时间: 2017-05
影响因子: 4.8
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发表时间: 2015-01
影响因子: 8.6
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三点相位相关性:非线性大尺度结构的新测量
DOI: 10.1088/0004-637x/804/2/132
发表时间: 2014
期刊: The Astrophysical Journal
影响因子: --
作者:
Richard Wolstenhulme;C. Bonvin;D. Obreschkow
通讯作者: D. Obreschkow
DOI: 10.1016/j.ascom.2015.07.003
发表时间: 2015-09-01
影响因子: 2.5
作者:
Howlett, C.;Manera, M.;Percival, W. J.
通讯作者: Percival, W. J.