2LPTIC: 2nd-order Lagrangian Perturbation Theory Initial Conditions

Details 2LPTIC: 2nd-order Lagrangian Perturbation Theory Initial Conditions 2LPTIC: 2nd-order Lagrangian Perturbation Theory Initial Conditions

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ascl.soft01005c&link_type=abstract

Astrophysics Source Code Library, record ascl:1201.005

Astronomy and Astrophysics

Astrophysics

Scientific paper

Setting initial conditions in numerical simulations using the standard procedure based on the Zel'dovich approximation (ZA) generates incorrect second and higher-order growth and therefore excites long-lived transients in the evolution of the statistical properties of density and velocity fields. Using more accurate initial conditions based on second-order Lagrangian perturbation theory (2LPT) reduces transients significantly; initial conditions based on 2LPT are thus much more appropriate for numerical simulations devoted to precision cosmology. The 2LPTIC code provides initial conditions for running cosmological simulations based on second-order Lagrangian Perturbation Theory (2LPT), rather than first-order (Zel'dovich approximation).

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