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• W2046285438 abstract "The joint probability distribution function (PDF) of the density within multiple concentric spherical cells is considered. It is shown how its cumulant generating function can be obtained at tree order in perturbation theory as the Legendre transform of a function directly built in terms of the initial moments. In the context of the upcoming generation of large-scale structure surveys, it is conjectured that this result correctly models such a function for finite values of the variance. Detailed consequences of this assumption are explored. In particular the corresponding one-cell density probability distribution at finite variance is computed for realistic power spectra, taking into account its scale variation. It is found to be in agreement with $mathrm{ensuremath{Lambda}}$-cold dark matter simulations at the few percent level for a wide range of density values and parameters. Related explicit analytic expansions at the low and high density tails are given. The conditional (at fixed density) and marginal probability of the slope---the density difference between adjacent cells---and its fluctuations is also computed from the two-cell joint PDF; it also compares very well to simulations. It is emphasized that this could prove useful when studying the statistical properties of voids as it can serve as a statistical indicator to test gravity models and/or probe key cosmological parameters." @default.
• W2046285438 created "2016-06-24" @default.
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• W2046285438 date "2014-11-14" @default.
• W2046285438 modified "2023-10-13" @default.
• W2046285438 title "Statistics of cosmic density profiles from perturbation theory" @default.
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• W2046285438 doi "https://doi.org/10.1103/physrevd.90.103519" @default.
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