Transients from Zel'dovich initial conditions
نویسندگان
چکیده
منابع مشابه
Transients from Zel’dovich initial conditions
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...
متن کاملTransients from Initial Conditions: A Perturbative Analysis
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...
متن کاملTransients 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...
متن کاملTransients from initial conditions based on Lagrangian perturbation theory in N-body simulations
We explore the initial conditions for cosmological N-body simulations suitable for calculating the higher-order cumulants of the density field. In general, the initial conditions based on the perturbation theory (PT) provide incorrect growth in next leading order, which are called transients. Before transients have been completely suppressed compared with the dominant growing mode, we can not r...
متن کاملTitle : State variables , initial conditions and transients of fractional order derivatives and systems
The sub-title of this presentation could be “The fractional order integrator approach”. Although fractional order differentiation is commonly considered as the basis of fractional calculus, its effective basis is in fact fractional order integration, mainly because definitions, calculation and properties of fractional derivatives and Fractional Differential Systems (FDS) rely deeply on fraction...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20020187