Transients from initial conditions in cosmological simulations
نویسندگان
چکیده
منابع مشابه
Transients from Initial Conditions in Cosmological Simulations
We study the impact of setting initial conditions in numerical simulations using the standard procedure based on the Zel’dovich approximation (ZA). As it is well known from perturbation theory, ZA initial conditions have incorrect second and higher-order growth and therefore excite long-lived transients in the evolution of the statistical properties of density and velocity fields. We also study...
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Abstract. We investigate the error implied by the use of the Zel’dovich approximation to set up the initial conditions at a finite redshift zi in numerical simulations. Using a steepest-descent method developed in a previous work (Valageas (2002a)) we derive the probability distribution P(δR) of the density contrast in the quasi-linear regime. This also provides its dependence on the redshift z...
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The standard procedure to generate initial conditions in numerical simulations of structure formation is to use the Zel’dovich approximation (ZA). Although the ZA correctly reproduces the linear growing modes of density and velocity perturbations, non-linear growth is inaccurately represented, particularly for velocity perturbations because of the ZA failure to conserve momentum. This implies t...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2006
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2006.11040.x