Journal
ASTROPHYSICAL JOURNAL
Volume 715, Issue 1, Pages 104-121Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/715/1/104
Keywords
large-scale structure of universe; methods: numerical
Categories
Funding
- DOE [W-7405-ENG-36]
- LDRD program at Los Alamos National Laboratory
- NASA
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Near-future cosmological observations targeted at investigations of dark energy pose stringent requirements on the accuracy of theoretical predictions for the nonlinear clustering of matter. Currently, N-body simulations comprise the only viable approach to this problem. In this paper, we study various sources of computational error and methods to control them. By applying our methodology to a large suite of cosmological simulations we show that results for the (gravity-only) nonlinear matter power spectrum can be obtained at 1% accuracy out to k similar to 1 h Mpc(-1). The key components of these high accuracy simulations are precise initial conditions, very large simulation volumes, sufficient mass resolution, and accurate time stepping. This paper is the first in a series of three; the final aim is a high-accuracy prediction scheme for the nonlinear matter power spectrum that improves current fitting formulae by an order of magnitude.
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