311 research outputs found
Studies on Granitic Pegmatites : Quantitative Spectrographic Determination of Magnesium and Iron in Biotites and other Minerals by the Means of the Logarithmic Sector
Spectrographic Distribution of Minor Elements in the Quartzs and Feldspars Contained in Granites and Pegmatites of the Qku-Tango District, Kyoto Prefecture
The Pegmatites of the Oku-Tango District of Kyoto Prefecture researched chiefly from the View-point of Trace Elements
Studies on Granitic Pegmatites (II) : Magnesium and Iron Contents of Biotites of Small Size in Granites and Pegmatites
Non-Gaussianity of the density distribution in accelerating universes
According to recent observations, the existence of the dark energy has been
considered. Even though we have obtained the constraint of the equation of the
state for dark energy () as by combining WMAP
data with other astronomical data, in order to pin down , it is necessary to
use other independent observational tools. For this purpose, we consider the
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 and is about 4% while that
between and is about . 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- region, which suggests that the
non-Gaussianity of the density distribution potentially plays an important role
for extracting the information of dark energy.Comment: 15 pages, 4 figures, accepted for publication in JCAP; v2: smoothing
scale has been change
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