skip to main content


This content will become publicly available on September 20, 2018

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

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.
 [1] ; ORCiD logo [2] ;  [3] ;  [4] ;  [5] ;  [2] ;  [6] ;  [2] ;  [2] ;  [7]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Univ. of Pennsylvania, Philadelphia, PA (United States); Kavli Inst. for the Physics and Mathematics of the Universe, Chiba (Japan)
  4. Univ. of Wisconsin, Madison, WI (United States)
  5. Simon Fraser Univ., Burnaby, BC (Canada)
  6. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Arlington, VA (United States). Virginia Bioinformatics Inst.
  7. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1538-4357; TRN: US1800993
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 847; Journal Issue: 1; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
97 MATHEMATICS AND COMPUTING; Astronomy and Astrophysics; Mathematics
OSTI Identifier: