期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2020/06/041
关键词
galaxy clustering; redshift surveys; cosmological parameters from LSS; cosmological perturbation theory
资金
- European Unions Horizon 2020 research and innovation programme ERC (BePreSySe) [725327]
- Spanish Ministerio de Ciencia y Innovation y Universidades [PGC2018-098866-B-I00]
We forecast the benefits induced by adding the bispectrum anisotropic signal to the standard, two- and three-point, clustering statistics analysis. In particular, we forecast cosmological parameter constraints including the bispectrum higher multipoles terms together with the galaxy power spectrum (monopole plus quadrupole) and isotropic bispectrum (monopole) data vectors. To do so, an analytical covariance matrix model is presented. This template is carefully calibrated on well-known terms of a numerical covariance matrix estimated from a set of simulated galaxy catalogues. After testing the calibration using the power spectrum and isotropic bispectrum measurements from the same set of simulations, we extend the covariance modelling to the galaxy bispectrum higher multipoles. Using this covariance matrix we proceed to perform cosmological parameter inference using a suitably generated mock data vector. Including the bispectrum mutipoles up to the hexadecapole, yields 1-D 68% credible regions for the set of parameters (b(1), b(2), f, sigma(8), f(NL),alpha(perpendicular to), alpha(parallel to)) tighter by a factor of 30% on average for k(max) = 0.09 h/Mpc, significantly reducing at the same time the degeneracies present in the posterior distribution.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据