Modeling Nonlinear Evolution of Baryon Acoustic Oscillations: Convergence Regime of N-body Simulations and Analytic Models
Oct, 2008Citations per year
Abstract: (arXiv)
We use a series of cosmological N-body simulations and various analytic models to study the evolution of matter power spectrum in a \Lambda Cold Dark Matter universe. We compare the results of N-body simulations against three analytical model predictions/ standard perturbation theory, renormalized perturbation theory and closure approximation. We take account of effects of finiteness of simulation boxsize in the comparison. We determine the values of the maximum wavenumbers, k^{lim}_{1%} and k^{lim}_{3%}, below which the analytic models and the simulation results agree to within 1 and 3 percent. We then provide a simple empirical function which describes the convergence regime determined by comparison between our simulations and those analytical models. We find that if we use the Fourier modes within the convergence regime alone, a characteristic scale of baryon acoustic oscillations can be determined within 1% accuracy from future surveys with a volume of a few h^{-3}Gpc^3 at z\sim1 or z\sim3.References(55)
Figures(14)