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Transients from initial conditions based on Lagrangian perturbation theory in $N$ $N$ -body simulations III: The case of Gadget-2 code

Department of Social Design Engineering, National Institute of Technology, Kochi College, 200-1 Monobe-Otsu, Nankoku, Kochi 783-8508, Japan

Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan

E-mail Address: tatekawa@akane.waseda.jp

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https://doi.org/10.1142/S0218271820500960Cited by:1 (Source: Crossref)

Abstract

In modern cosmology, the precision of the theoretical prediction is increasingly required. In cosmological $N$ $N$ -body simulations, the effect of higher-order Lagrangian perturbation on the initial conditions appears in terms of statistical quantities of matter density field. We have considered the effect of third-order Lagrangian perturbation theory (3LPT) on the initial conditions, which can be applied to Gadget-2 code. Then, as statistical quantities, non-Gaussianity of matter density field has been compared between cases of different order perturbations for the initial conditions. Then, we demonstrate the validity of the initial conditions with second-order Lagrangian perturbation theory (2LPT).

Keywords:

PACS: 02.60.Cb, 02.70.−c, 04.25.−g, 98.65.Dx

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