Primordial non-Gaussianities with weak lensing: information on non-linear scales in the Ulagam full-sky simulations

被引：3

作者：

Anbajagane, Dhayaa ^{[1
,2
]}

Chang, Chihway ^{[1
,2
]}

Lee, Hayden ^{[2
]}

Gatti, Marco ^{[3
]}

机构：

[1] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[2] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[3] Univ Penn, Ctr Particle Cosmol, Dept Phys & Astron, Philadelphia, PA 19104 USA

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2024年 / 03期

关键词：

cosmological simulations; gravitational lensing; inflation; weak gravitational lensing; N-BODY SIMULATIONS; HALO MASS FUNCTION; DARK-MATTER HALOS; COSMOLOGICAL SIMULATIONS; MODELS; ENERGY; BIAS; CONTRACTION; BARYONS; IMPACT;

D O I：

10.1088/1475-7516/2024/03/062

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Primordial non-Gaussianities (PNGs) are signatures in the density field that encode particle physics processes from the inflationary epoch. Such signatures have been extensively studied using the Cosmic Microwave Background, through constraining their amplitudes, fXNL, with future improvements expected from large-scale structure surveys; specifically, the galaxy correlation functions. We show that weak lensing fields can be used to achieve competitive and complementary constraints. This is shown via the ULAGAM suite of N -body simulations, a subset of which evolves primordial fields with four types of PNGs. We create full -sky lensing maps and estimate the Fisher information from three summary statistics measured on the maps: the moments, the cumulative distribution function, and the 3 -point correlation function. We find that the year 10 sample from the Rubin Observatory Legacy Survey of Space and Time (LSST) can constrain PNGs to sigma(f eq NL) approximate to 110, sigma(f or, lss NL ) approximate to 120, sigma(floc NL ) approximate to 40. For the former two, this is better than or comparable to expected galaxy clustering -based constraints from the Dark Energy Spectroscopic Instrument (DESI). The PNG information in lensing fields is on non-linear scales and at low redshifts (z less than or similar to 1.25), with a clear origin in the evolution history of massive halos. The constraining power degrades by similar to 60% under scale cuts of greater than or similar to 20 Mpc, showing there is still significant information on scales mostly insensitive to small-scale systematic effects (e.g., baryons). We publicly release the ULAGAM suite to enable more survey -focused analyses.

引用

页数：54

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