Efficient Construction of Mock Catalogs for Baryon Acoustic Oscillation Surveys

Abstract

Precision measurements of the large scale structure of the Universe require large numbers of high fidelity mock catalogs to accurately assess, and account for, the presence of systematic effects. We introduce and test a scheme for generating mock catalogs rapidly using suitably derated N-body simulations. Our aim is to reproduce the large scale structure and the gross properties of dark matter halos with high accuracy, while sacrificing the details of the internal structure of the halos. By adjusting global and local time-steps in an N-body code, we demonstrate that we recover halo masses to better than 0.5% and the power spectrum to better than 1% both in real and redshift space for k = 1h/Mpc, while requiring a factor of 4 less CPU time. We also calibrate the redshift spacing of outputs required to generate simulated light cones. We find that outputs separated by every z = 0.05 allow us to interpolate particle positions and velocities to reproduce the real and redshift space power spectra to better than 1% (out to k = 1h/Mpc). We apply these ideas to generate a suite of simulations spanning a range of cosmologies, motivated by the Baryon Oscillation Spectroscopic Survey (BOSS) but broadly applicable to future large scale structure surveys including eBOSS and DESI. As an initial demonstration of the utility of such simulations, we calibrate the shift in the baryonic acoustic oscillation peak position as a function of galaxy bias with higher precision than has been possible so far. This paper also serves to document the simulations, which we make publicly available.

23 pages, 14 figures, submitted to JCAP, Mock catalogs are available at http://www.hep.anl.gov/cosmology/mock.html , fixed the link to the simulations. arXiv admin note: text overlap with arXiv:1410.2805 by other authors

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Cited by in corpus (11)

• FastPM: a new scheme for fast simulations of dark matter and halos
• Large-scale dark matter simulations
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
• The Mira-Titan Universe II: Matter Power Spectrum Emulation
• The Gaussian streaming model and Lagrangian effective field theory
• A gradient based method for modeling baryons and matter in halos of fast simulations
• Bispectrum as Baryon Acoustic Oscillation Interferometer
• Supporting High-Performance and High-Throughput Computing for Experimental Science
• Tests of Acoustic Scale Shifts in Halo-based Mock Galaxy Catalogues
• Non-linear Structure Formation for Dark Energy Models with a Steep Equation of State