Screening vs. gevolution: In chase of a perfect cosmological simulation code


Eingorn M., Yükselci A. E. , Zhuk O.

PHYSICS LETTERS B, vol.826, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 826
  • Publication Date: 2022
  • Doi Number: 10.1016/j.physletb.2022.136911
  • Journal Name: PHYSICS LETTERS B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, INSPEC, zbMATH, Directory of Open Access Journals
  • Keywords: N -body simulation, Large-scale structure, Inhomogeneous Universe, Cosmological perturbations, Gevolution, Cosmic screening, EVOLUTION, GALAXIES
  • Istanbul Technical University Affiliated: Yes

Abstract

We compare two competing relativistic approaches to the N-body simulation of the Universe large-scale structure. To this end, employing the corresponding alternative computer codes ( "gevolution " and "screening "), we conduct a series of cosmological simulations in boxes of different sizes and calculate the power spectra of the scalar perturbation Phi, the frame-dragging vector potential B and the difference between scalar modes chi=Phi-psi. We demonstrate that the corresponding power spectra are in very good agreement between the compared schemes. For example, the relative difference of the power spectra for Phi is 0.04% maximum. Since the perturbed Einstein equations have much simpler form in the screening approach, the simulation with this code consumes less computational time, saving almost 40% of CPU hours. (C)& nbsp;2022 The Author(s). Published by Elsevier B.V.& nbsp;