Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-12-05
Astrophys.J.715:104-121,2010
Astronomy and Astrophysics
Astrophysics
18 pages, 22 figures, minor changes to address referee report
Scientific paper
10.1088/0004-637X/715/1/104
Near-future cosmological observations targeted at investigations of dark energy pose stringent requirements on the accuracy of theoretical predictions for the clustering of matter. Currently, N-body simulations comprise the only viable approach to this problem. In this paper we demonstrate that N-body simulations can indeed be sufficiently controlled to fulfill these requirements for the needs of ongoing and near-future weak lensing surveys. By performing a large suite of cosmological simulation comparison and convergence tests we show that results for the nonlinear matter power spectrum can be obtained at 1% accuracy out to k~1 h/Mpc. 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, with the final aim to provide a high-accuracy prediction scheme for the nonlinear matter power spectrum.
Habib Salman
Heitmann Katrin
Higdon David
Wagner Christian
White Martin
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