Author:
Biagetti Matteo,Calles Juan,Castiblanco Lina,Cole Alex,Noreña Jorge
Abstract
Abstract
We study the information content of summary statistics built from the multi-scale topology
of large-scale structures on primordial non-Gaussianity of the local and equilateral type. We use
halo catalogs generated from numerical N-body simulations of the Universe on large scales as a
proxy for observed galaxies. Besides calculating the Fisher matrix for halos in real space, we
also check more realistic scenarios in redshift space. Without needing to take a distant observer
approximation, we place the observer on a corner of the box. We also add redshift errors
mimicking spectroscopic and photometric samples. We perform several tests to assess the
reliability of our Fisher matrix, including the Gaussianity of our summary statistics and
convergence. We find that the marginalized 1-σ uncertainties in redshift space are
Δf
NL
loc ∼ 16 and Δf
NL
equi ∼ 41 on a survey volume of 1 (Gpc/h)3. These
constraints are weakly affected by redshift errors. We close by speculating as to how this
approach can be made robust against small-scale uncertainties by exploiting (non)locality.
Subject
Astronomy and Astrophysics
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献