English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We study the structure and evolution of dark matter halos from z = 300 to z =6 for two cosmological N-body simulation initialization techniques. While thesecond order Lagrangian perturbation theory (2LPT) and the Zel'dovichapproximation (ZA) both produce accurate present day halo mass functions,earlier collapse of dense regions in 2LPT can result in larger mass halos athigh redshift. We explore the differences in dark matter halo mass andconcentration due to initialization method through three 2LPT and three ZAinitialized cosmological simulations. We find that 2LPT induces more rapid halogrowth, resulting in more massive halos compared to ZA. This effect is mostpronounced for high mass halos and at high redshift. Halo concentration is, onaverage, largely similar between 2LPT and ZA, but retains differences whenviewed as a function of halo mass. For both mass and concentration, thedifference between typical individual halos can be very large, highlighting theshortcomings of ZA-initialized simulations for high-z halo population studies.

Early Growth in a Perturbed Universe: Exploring Dark Matter Halo Populations in 2LPT and ZA Simulations