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Shell-crossing in a $\Lambda$CDM Universe

Authors
  • Rampf, Cornelius
  • Hahn, Oliver
Type
Published Article
Publication Date
Jun 24, 2021
Submission Date
Oct 23, 2020
Identifiers
DOI: 10.1093/mnrasl/slaa198
Source
arXiv
License
Yellow
External links

Abstract

Perturbation theory is an indispensable tool for studying the cosmic large-scale structure, and establishing its limits is therefore of utmost importance. One crucial limitation of perturbation theory is shell-crossing, which is the instance when cold-dark-matter trajectories intersect for the first time. We investigate Lagrangian perturbation theory (LPT) at very high orders in the vicinity of the first shell-crossing for random initial data in a realistic three-dimensional Universe. For this we have numerically implemented the all-order recursion relations for the matter trajectories, from which the convergence of the LPT series at shell-crossing is established. Convergence studies performed up to the 40th order reveal the nature of the convergence-limiting singularities. These singularities are not the well-known density singularities at shell-crossing but occur at later times when LPT already ceased to provide physically meaningful results.

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