The Mira-Titan Universe. II. Matter Power Spectrum Emulation

Lawrence, Earl; Heitmann, Katrin; Kwan, Juliana; Upadhye, Amol; Bingham, Derek; Habib, Salman; Higdon, David; Pope, Adrian; Finkel, Hal; Frontiere, Nicholas

doi:10.3847/1538-4357/aa86a9

Title: The Mira-Titan Universe. II. Matter Power Spectrum Emulation

Journal Article · Wed Sep 20 00:00:00 EDT 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa86a9· OSTI ID:1417158

Lawrence, Earl ^[1];

^[2]; Kwan, Juliana ^[3]; Upadhye, Amol ^[4]; Bingham, Derek ^[5]; Habib, Salman ^[2]; Higdon, David ^[6]; Pope, Adrian ^[2]; Finkel, Hal ^[2]; Frontiere, Nicholas ^[7]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States); Kavli Inst. for the Physics and Mathematics of the Universe, Chiba (Japan)
Univ. of Wisconsin, Madison, WI (United States)
Simon Fraser Univ., Burnaby, BC (Canada)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Arlington, VA (United States). Virginia Bioinformatics Inst.
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)

We introduce a new cosmic emulator for the matter power spectrum covering eight cosmological parameters. Targeted at optical surveys, the emulator provides accurate predictions out to a wavenumber k ~ 5Mpc^-1 and redshift z ≤ 2. Besides covering the standard set of CDM parameters, massive neutrinos and a dynamical dark energy of state are included. The emulator is built on a sample set of 36 cosmological models, carefully chosen to provide accurate predictions over the wide and large parameter space. For each model, we have performed a high-resolution simulation, augmented with sixteen medium-resolution simulations and TimeRG perturbation theory results to provide accurate coverage of a wide k-range; the dataset generated as part of this project is more than 1.2Pbyte. With the current set of simulated models, we achieve an accuracy of approximately 4%. Because the sampling approach used here has established convergence and error-control properties, follow-on results with more than a hundred cosmological models will soon achieve ~1% accuracy. We compare our approach with other prediction schemes that are based on halo model ideas and remapping approaches. The new emulator code is publicly available.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1417158

Report Number(s):: LA-UR-17-21941; TRN: US1800993

Journal Information:: The Astrophysical Journal (Online), Vol. 847, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 49 works

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The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: Baryon Acoustic Oscillations in the Data Release 10 and 11 galaxy samples Anderson, Lauren; Aubourg, Eric; Bailey, Stephen arXiv https://doi.org/10.48550/arxiv.1312.4877	text	January 2013
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HACC: Simulating Sky Surveys on State-of-the-Art Supercomputing Architectures Habib, Salman; Pope, Adrian; Finkel, Hal arXiv https://doi.org/10.48550/arxiv.1410.2805	text	January 2014
An accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models Mead, Alexander; Peacock, John; Heymans, Catherine arXiv https://doi.org/10.48550/arxiv.1505.07833	text	January 2015
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