Convergence of halo statistics: code comparison between Rockstar and CompaSO using scale-free simulations

Abstract

In this study, we perform a halo-finder code comparison between Rockstar and CompaSO. Based on our previous analysis aiming at quantifying resolution of $N$-body simulations by exploiting large (up to $N=4096^3$) simulations of scale-free cosmologies run using Abacus, we focus on convergence of the HMF, 2PCF and mean radial pairwise velocities of halo centres selected with the aforementioned two algorithms. We establish convergence, for both Rockstar and CompaSO, of mass functions at the $1\%$ precision level and of the mean pairwise velocities (and also 2PCF) at the $2\%$ level. At small scales and small masses, we find that Rockstar exhibits greater self-similarity, and we also highlight the role played by the merger-tree post-processing of CompaSO halos on their convergence. Finally, we give resolution limits expressed as a minimum particle number per halo in a form that can be directly extrapolated to LCDM.

13 pages, accepted in MNRAS. arXiv admin note: substantial text overlap with arXiv:2211.07607

References in corpus (27)

• A Universal Density Profile from Hierarchical Clustering
• Toward a halo mass function for precision cosmology: the limits of universality
• Mass function of dark matter halos
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• The Structure of Dark Matter Haloes in Hierarchical Clustering Models
• Haloes gone MAD: The Halo-Finder Comparison Project
• A universal model for halo concentrations
• An accurate physical model for halo concentrations
• AbacusSummit: A Massive Set of High-Accuracy, High-Resolution $N$-Body Simulations
• Corrfunc --- A Suite of Blazing Fast Correlation Functions on the CPU
• Structure Finding in Cosmological Simulations: The State of Affairs
• The $\text{Abacus}$ Cosmological $N$-body Code
• \textsc{CompaSO}: A new halo finder for competitive assignment to spherical overdensities
• Self-similarity and scaling behavior of scale-free gravitational clustering
• Improving Initial Conditions for Cosmological $N$-Body Simulations
• Einasto Profiles and the Dark Matter Power Spectrum
• Dark Matter Halo Profiles in Scale-Free Cosmologies
• Quantification of discreteness effects in cosmological N-body simulations: II. Evolution up to shell crossing
• Corrfunc: Blazing fast correlation functions with AVX512F SIMD Intrinsics
• Subhaloes in Scale-Free Cosmologies
• Quantifying resolution in cosmological N-body simulations using self-similarity
• Constructing high-fidelity halo merger trees in AbacusSummit
• Testing dark matter halo properties using self-similarity
• Good and Proper: Self-similarity of N-body Simulations with Proper Force Softening
• Accuracy of power spectra in dissipationless cosmological simulations
• Self-Similarity of $k$-Nearest Neighbor Distributions in Scale-Free Simulations