CoLoRe: fast cosmological realisations over large volumes with multiple tracers

Abstract

We present CoLoRe, a public software package to efficiently generate synthetic realisations of multiple cosmological surveys. CoLoRe can simulate the growth of structure with different degrees of accuracy, with the current implementation supporting lognormal fields, first, and second order Lagrangian perturbation theory. CoLoRe simulates the density field on an all-sky light-cone up to a desired maximum redshift, and uses it to generate multiple 2D and 3D maps: galaxy positions and velocities, lensing (shear, magnification, convergence), integrated Sachs-Wolfe effect, line intensity mapping, and line of sight skewers for simulations of the Lyman-$\alpha$ forest. We test the accuracy of the simulated maps against analytical theoretical predictions, and showcase its performance with a multi-survey simulation including DESI galaxies and quasars, LSST galaxies and lensing, and SKA intensity mapping and radio galaxies. We expect CoLoRe to be particularly useful in studies aiming to characterise the impact of systematics in multi-experiment analyses, quantify the covariance between different datasets, and test cross-correlation pipelines for near-future surveys.

Accepted for publication in JCAP. Minor changes with respect to v1 and updated list of references. Code available at https://github.com/damonge/CoLoRe

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• Fast simulations for intensity mapping experiments
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Cited by in corpus (18)

• DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman Alpha Forest
• Constraints on the cosmic expansion rate at redshift 2.3 from the Lyman-$\alpha$ forest
• GLASS: Generator for Large Scale Structure
• The 3D Lyman-$\alpha$ Forest Power Spectrum from eBOSS DR16
• Constraining a late time transition of $G_{\mathrm{eff}}$ using low-z galaxy survey data
• The Alcock-Paczyński effect from Lyman-$\alpha$ forest correlations: Analysis validation with synthetic data
• Probing cosmic isotropy in the Local Universe
• Synthetic spectra for Lyman-$\alpha$ forest analysis in the Dark Energy Spectroscopic Instrument
• Direct cosmological inference from three-dimensional correlations of the Lyman-$\alpha$ forest
• A multi-tracer empirically-driven approach to line-intensity mapping lightcones
• Baryon acoustic scale at $z_{\eff} = 0.166$ with the SDSS blue galaxies
• Probing the cosmic web in Ly$\alpha$ emission over large scales: an Intensity Mapping forecast for DECaLS/BASS and DESI
• Fast Simulation of Cosmological Neutral Hydrogen based on the Halo Model
• Angular Correlation Function from sample covariance with BOSS and eBOSS LRG
• The Lyman-$\alpha$ Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology
• Influence of photometric galaxies redshift distribution in BAO estimation
• Optimal data compression for Lyman-$\alpha$ forest cosmology
• Bridging Simulations and EFT: A Hybrid Model of the Lyman-Alpha Forest Field