### Abstract

According to recent observations, the existence of dark energy has been considered. Even though we have obtained the constraint of the equation of the state for dark energy (p ≤ wρ) as -1 ≤ w ≤ -0.78 by combining WMAP data with other astronomical data, in order to pin down w, it is necessary to use other independent observational tools. For this purpose, we consider the w dependence of the non-Gaussianity of the density distribution generated by nonlinear dynamics. To extract the non-Gaussianity, we follow a semi-analytic approach based on Lagrangian linear perturbation theory, which provides an accurate value for the quasi-nonlinear region. From our results, the difference of the non-Gaussianity between w ≤ -1 and -0.5 is about 4%, while that between w ≤ -1 and -0.8 is about 0.9%. For the highly non-linear region, we estimate the difference by combining this perturbative approach with N-body simulation executed for our previous paper. From this, we can expect the difference to be more enhanced in the low-z region, which suggests that the non-Gaussianity of the density distribution potentially plays an important role for extracting information on dark energy.

Original language | English |
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Article number | 006 |

Journal | Journal of Cosmology and Astroparticle Physics |

Issue number | 2 |

DOIs | |

Publication status | Published - 2006 Feb 1 |

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### Keywords

- Cosmic flows
- Cosmological perturbation theory
- Dark energy theory

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Journal of Cosmology and Astroparticle Physics*, (2), [006]. https://doi.org/10.1088/1475-7516/2006/02/006