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- W4315705729 abstract "Context: Analyzing the large-scale structure (LSS) with galaxy surveys demands accurate structure formation models. Such models should ideally be fast and have a clear theoretical framework to rapidly scan a variety of cosmological parameter spaces without requiring large training data sets. Aims: This study aims to extend Lagrangian perturbation theory (LPT), including viscosity and vorticity, to reproduce the cosmic evolution from dark matter N-body calculations at the field level. Methods: We extend LPT to an Eulerian framework, dubbed eALPT. An ultraviolet regularisation through the spherical collapse model provided by Augmented LPT, turns out to be crucial at low redshifts. This enables modelling the stress tensor, with this introducing vorticity. The model has two free parameters apart from the choice of cosmology, redshift snapshots, cosmic volume, and the number of particles-cells. Results: We find that the cross-correlation of the dark matter distribution as compared to N-body solvers increases at $k = 1,h$ Mpc$^{-1}$ and $z = 0$ from $sim$55% with the Zel'dovich approximation ($sim$70% with ALPT), to $sim$95% with three timesteps eALPT, and power spectra within percentage accuracy up to $k simeq 0.3,h$ Mpc$^{-1}$." @default.
- W4315705729 created "2023-01-12" @default.
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- W4315705729 date "2023-01-09" @default.
- W4315705729 modified "2023-09-27" @default.
- W4315705729 title "The Cosmic Web from Perturbation Theory" @default.
- W4315705729 doi "https://doi.org/10.48550/arxiv.2301.03648" @default.
- W4315705729 hasPublicationYear "2023" @default.
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