# Benjamin L’Huillier(벤자민)

Cosmologist and Astrophysicist, Research Fellow at KASI, Daejeon, South Korea

# Cosmological simulations

My main tool of research is the use of cosmological simulation to study the evolution of galaxies and their dark mattr haloes with the large-scale structures of the Universe.

I have participated in the design and analysis of the Horizon Run 4 simulation.

## Horizon run 4

J. Kim, C. Park, B. L'Huillier, & S. E. Hong 2015, JKAS 48, 213

The Horizon run 4 simulation is the latest run in our series of Horizon runs 1, 2, and 3, using the same WMAP5 cosmology. Its higher resolution, $6300^3$ particles in a $3150\,h^{-1}\,\text{Mpc}$ box, and the use of second order perturbation theory (2LPT) initial conditions, makes it ideal to simulate the cosmological evolution of haloes more massive than about $2\times 10^{11} \,h^{-1} \, M_\odot$.

## Effects of the initial conditions on cosmological N-body simulations

B. L'Huillier, C. Park & J. Kim 2014, New Astronomy 30, 79
With Changbom Park and Juhan Kim, I have studied the dependency of N-body simulations on the initial conditions (ICs).

High redshft, 2LPT initial conditions are needed if one aims to obain robust results for the mass function and power spectrum.