Transients from initial conditions based on Lagrangian perturbation theory in N-body simulations II: the effect of the transverse mode
- Center for Information initiative, 3-9-1 Bunkyo, Fukui, 910-8709 JAPAN (Japan)
We study the initial conditions for cosmological N-body simulations for precision cosmology. In general, Zel'dovich approximation has been applied for the initial conditions of N-body simulations for a long time. These initial conditions provide incorrect higher-order growth. These error caused by setting up the initial conditions by perturbation theory is called transients. We investigated the impact of transient on non-Gaussianity of density field by performing cosmological N-body simulations with initial conditions based on first-, second-, and third-order Lagrangian perturbation theory in previous paper. In this paper, we evaluates the effect of the transverse mode in the third-order Lagrangian perturbation theory for several statistical quantities such as power spectrum and non-Gaussianty. Then we clarified that the effect of the transverse mode in the third-order Lagrangian perturbation theory is quite small.
- OSTI ID:
- 22373636
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Third-order perturbative solutions in Lagrangian perturbation theory with pressure. II. Effect of the transverse modes
Lagrangian perturbations and the matter bispectrum I: fourth-order model for non-linear clustering