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

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

Postby owlice » Tue Jan 03, 2012 5:27 am

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

Abstract: 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).

Credit: M. Crocce, S. Pueblas, R. Scoccimarro

Site: http://cosmo.nyu.edu/roman/2LPT/

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