The bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and non-linear galaxy bias
The bispectrum of galaxies from high-redshift galaxy surveys: Primordial non-Gaussianity and non-linear galaxy bias
复制标题
DOI：
10.1103/physrevd.76.083004
复制
发表时间：
2007-05
影响因子：
5
通讯作者：
E. Sefusatti;E. Komatsu
中科院分区：
文献类型：
--
作者：
E. Sefusatti;E. Komatsu
在解释任何调查的星系团数据时，最大的挑战是星系偏差。使用一个简单的Fisher矩阵分析，我们表明，双谱提供了一个很好的确定线性和非线性偏置参数的中间和高Z星系，当所有可测量的三角形配置下降到轻度非线性尺度，微扰理论仍然有效，包括在内。双谱也是对原始非高斯性的有力探索。在z {approx}> 2的计划星系调查应产生对非高斯参数f{sub NL}{sup loc.}的约束。和f{sub NL}{sup eq.}，与CMB实验结果相当甚至更好。我们研究了这些约束如何改善体积，红移范围，以及星系的数密度。最后，我们表明，晕占领分布可以用来进一步提高这些约束，通过解除重力，偏见和原始非高斯之间的退化。
The greatest challenge in the interpretation of galaxy clustering data from any surveys is galaxy bias. Using a simple Fisher matrix analysis, we show that the bispectrum provides an excellent determination of linear and non-linear bias parameters of intermediate and high-z galaxies, when all measurable triangle configurations down to mildly non-linear scales, where perturbation theory is still valid, are included. The bispectrum is also a powerful probe of primordial non-Gaussianity. The planned galaxy surveys at z {approx}> 2 should yield constraints on non-Gaussian parameters, f{sub NL}{sup loc.} and f{sub NL}{sup eq.}, that are comparable to, or even better than, those from CMB experiments. We study how these constraints improve with volume, redshift range, as well as the number density of galaxies. Finally we show that a halo occupation distribution may be used to improve these constraints further by lifting degeneracies between gravity, bias, and primordial non-Gaussianity.