Skip to Main content Skip to Navigation
Journal articles

Quantification of discreteness effects in cosmological N-body simulations: Initial Conditions

Abstract : We discuss the generation, using the "Zeldovich approximation'', of initial conditions for cosmological N-body simulations. We give an exact analytical formula for the power spectrum (PS) of such initial conditions, including the contribution coming from the "pre-initial'' (unperturbed) distribution. Using one dimensional simulations we study both the ensemble properties of the initial conditions with respect to the theoretical ones, and finite-size effects in this representation. While the PS typically represents well the input (theoretical) PS at wavenumbers below that characteristic of the discreteness, we find that the range of scale, if any, over which the theoretical real space correlation properties (e.g. the two point correlation function and real space mass variance) are well represented by the those of the discretised system, is strongly model dependent.
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00086595
Contributor : Dominique Girod <>
Submitted on : Wednesday, July 19, 2006 - 11:22:22 AM
Last modification on : Wednesday, September 16, 2020 - 4:05:07 PM

Links full text

Identifiers

Citation

M. Joyce, B. Marcos. Quantification of discreteness effects in cosmological N-body simulations: Initial Conditions. Physical Review D, American Physical Society, 2007, 75, pp.063516. ⟨10.1103/PhysRevD.75.063516⟩. ⟨in2p3-00086595⟩

Share

Metrics