Статья

THE COYOTE UNIVERSE. I. PRECISION DETERMINATION OF THE NONLINEAR MATTER POWER SPECTRUM

Katrin HeitmannISR-1, ISR Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USAMartin WhiteDepartments of Physics and Astronomy, University of California, Berkeley, CA 94720, USAChristian WagnerAstrophysikalisches Institut Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, GermanySalman HabibT-2, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USADavid HigdonCCS-6, CCS Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA

2010en

ABI

Аннотация

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 ∼ 1hMpc −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, with the final aim to provide a high-accuracy prediction scheme for the nonlinear matter power spectrum. Subject headings: methods: N-body simulations — cosmology: large-scale structure of universe

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Идентификаторы

DOI: 10.1088/0004-637x/715/1/104

Цитирования и источники

Цитирований: 2Использованных источников: 0

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