http://arxiv.org/abs/1401.6472
In this paper we present a suite of cosmological $N$-body simulations made using either $2 \times 768^3 \simeq 1$ billion or $2 \times 192^3 \simeq 14$ million Baryonic gas and cold dark matter particles, spanning volumes of $( 25 \,{\rm Mpc.h^{-1}})^3$ for high-resolution simulations, or of $(100 \,{\rm Mpc.h^{-1}})^3$ for large-volume ones. The main goal of these simulations is to evaluate the effect of several cosmological and astrophysical parameters on the 1D power spectrum of the transmitted flux fraction derived from the Lyman-$\alpha$ forest of quasar spectra. Using a splicing technique, the resolution can be further enhanced to reach the equivalent of simulations with $2 \times 3072^3 \simeq 58$ billion particles in a $(100 \,{\rm Mpc.h^{-1}} )^3$ volume. The simulations we present here therefore provide high enough precision to be used not only with current experiments such as the Baryonic Oscillation Spectroscopic Survey (SDSS-III/BOSS), but also with future spectroscopic surveys such as SDSS-IV/eBOSS or DESI. By varying the input parameters, we built a grid of simulations that allows the study of the impact on the matter power spectrum of four cosmological parameters ($n_s$, $\sigma_8$, $\Omega_m$ and $H_0$) and two astrophysical parameters related to the heating rate of the intergalactic medium ($T_0$ and $\gamma$), up to second order around a best guess model compatible with the latest Planck results.
Tue, 28 Jan 14
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