Perturbation-theory informed integrators for cosmological simulations

Understand

Large-scale cosmological simulations are an indispensable tool for modern cosmology.

• To enable model-space exploration, fast and accurate predictions are critical.
• In this paper, we show that the performance of such simulations can be further improved with time-stepping schemes that use input from cosmological perturbation theory.
• Specifically, we introduce a class of time-stepping schemes derived by matching the particle trajectories in a single leapfrog/Verlet drift-kick-drift step to those predicted by Lagrangian perturbation theory (LPT).