Benjamin L’Huillier


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.