Forecasts on primordial non-Gaussianity from 21 cm intensity mapping experiments

被引：36

作者：

Karagiannis, Dionysios ^{[1
,3
]}

Slosar, Anze ^{[2
]}

Liguori, Michele ^{[1
,3
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron G Galilei, Via Marzolo 8, I-35131 Padua, Italy

[2] Brookhaven Natl Lab, Phys Dept, 98 Rochester St, Upton, NY 11973 USA

[3] Ist Nazl Fis Nucl, Sez Padova, Via Marzolo 8, I-35131 Padua, Italy

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2020年 / 11期

关键词：

galaxy clustering; high redshift galaxies; non-gaussianity; redshift surveys; LARGE-SCALE BIAS; GALAXY FORMATION; HALO MODEL; NONLINEAR EVOLUTION; NEUTRAL HYDROGEN; POWER SPECTRUM; BISPECTRUM; UNIVERSE; CONSTRAINTS; SPACE;

D O I：

10.1088/1475-7516/2020/11/052

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We forecast the ability of dedicated 21 cm intensity mapping experiments to constraint primordial non-Gaussianity using power spectrum and bispectrum. We model the signal by including the non-linear biasing expansion through a generalized halo model approach. We consider the importance of foreground filtering scale and of the foreground wedge. We find that the current generation intensity mapping experiments like CHIME do not posses sufficient sensitivity to be competitive with the existing limits. On the other hand, upcoming experiments like HIRAX can improve the current constraints and the proposed PUMA experiment can substantially improve them, reaching sensitivities below sigma(f(NL)) < 5 for equilateral and orthogonal configurations and sigma(f(NL)) < 1 for the local shape, if good foreground control is achieved.

引用

页数：32

共 144 条

[51] BIASING AND HIERARCHICAL STATISTICS IN LARGE-SCALE STRUCTURE [J].