Initial condition problem for cosmological N-body simulations

T. Tatekawa, S. Mizuno

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

For a long time, the Lagrangian linear perturbation (Zel'dovich approximation, ZA) is used for initial conditions for cosmological N-body simulations. Recently, Crocce et al. (2006) proposed the improvement of the initial conditions. They applied Lagrangian second-order perturbation (2LPT) for the initial condition. Then they calculated the Lagrangian linear perturbation and showed that 2LPT initial conditions improve the evolution of non-Gaussianity for the density fluctuation in the Universe. Here we have one question. Although 2LPT initial conditions improve the cosmological N-body simulation, is 2LPT initial conditions sufficient? To answer this question, in addition to the ZA and 2LPT, we also calculate the non-Gaussianity with the initial conditions based on third-order Lagrangian perturbation theory (3LPT). Then we show reasonable order of perturbation and redshift for the initial conditions.

Original languageEnglish
Title of host publicationEAS Publications Series
Pages109-110
Number of pages2
Volume36
DOIs
Publication statusPublished - 2009
Externally publishedYes

Publication series

NameEAS Publications Series
Volume36
ISSN (Print)16334760
ISSN (Electronic)16381963

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ASJC Scopus subject areas

  • Engineering(all)

Cite this

Tatekawa, T., & Mizuno, S. (2009). Initial condition problem for cosmological N-body simulations. In EAS Publications Series (Vol. 36, pp. 109-110). (EAS Publications Series; Vol. 36). https://doi.org/10.1051/eas/0936015