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Initial condition problem for cosmological N-body simulations

Published online by Cambridge University Press:  30 May 2009

E. Pécontal ,
T. Buchert ,
Ph. Di Stefano ,
Y. Copin ,
T. Tatekawa  and
S. Mizuno
T. Tatekawa
Affiliation:
Department of Physics, Ochanomizu University, 2-1-1 Otsuka, Bunkyo, Tokyo 112-8610, Japan
S. Mizuno
Affiliation:
Research Center for the Early Universe (RESCEU), School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
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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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 36: Dark Energy and Dark Matter: Observations, Experiments and Theories , 2009 , pp. 109 - 110
Copyright
© EAS, EDP Sciences, 2009

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References

Crocce, M., Pueblas, S., & Scoccimarro, R., 2006, MNRAS, 373, 369 CrossRef
Tatekawa, T., & Mizuno, S., 2007, JCAP, 12, 014 CrossRef
Tatekawa, T., & Mizuno, S., in preparation
Zel'dovich, Ya.B., 1970, A&A, 5, 84