期刊
ASTROPHYSICAL JOURNAL
卷 847, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa86a9
关键词
dark energy; large-scale structure of universe
资金
- National Science Foundation [PHY-1066293]
- DOE [W-7405-ENG-36]
- Argonne National Laboratory's under U.S. Department of Energy [DE-AC02-06CH11357]
- U.S. Department of Energy, Office of Science
- DOE/SC [DE-AC02-06CH11357]
- Office of Science of the U.S. Department of Energy [DE-AC05-00OR22725]
- Advanced Scientific Computing Research and High Energy Physics
- Grants-in-Aid for Scientific Research [17K14274] Funding Source: KAKEN
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 similar to 5 Mpc(-1) and redshift z <= 2. In addition to covering the standard set of Lambda 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 16 medium-resolution simulations and TimeRG perturbation theory results to provide accurate coverage over a wide k-range; the data set generated as part of this project is more than 1.2Pbytes. 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-up results with more than a hundred cosmological models will soon achieve similar to 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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