Physical Cosmology Group

Sejong University, Seoul

Benjamin L'Huillier

Benjamin L'Huillier | 벤자민 루일리예

Assistant Professor

I combine cosmological N-body simulations and advanced statistical methods to test the concordance model of cosmology, trying to understand:

  • the nature of cosmic acceleration — modified gravity & dark energy;
  • inflation and the early Universe.

Team

Using state-of-the-art data and simulations, we aim to understand the nature of dark energy and dark matter, and the initial conditions and contents of the Universe.

Portrait of Cléa Millard | 클레아

PhD Candidate

Cléa Millard | 클레아

Fall 2024 – present

Type Ia supernova cosmology.

Portrait of Hyeon Kim | 김현

Integrated Master–PhD

Hyeon Kim | 김현

Spring 2023 – present

Cosmological simulations, cluster cosmology, the early Universe.

Portrait of Si Hyeong Noh | 노시형

PhD Candidate

Si Hyeong Noh | 노시형

Fall 2026 – present (M.Sc. 2023–2025)

Gravitational theory, testing modified gravity, data analysis.

Portrait of Kangsoo Lee | 이강수

Undergraduate Researcher

Kangsoo Lee | 이강수

Since September 2026

Interns

Portrait of Mathias Tan

Master's Intern

Mathias Tan

Since September 2026

Cosmological Applications of Optimal Transport. CentraleSupélec, France.

Alumni

  • Tarik Ouadjou — Master's intern, Spring 2026 (CentraleSupélec, France). Machine learning for the Square Kilometre Array, co-supervised with A. Rimmel.
  • Ussan Abbassi — Master's intern, Spring 2026 (École Normale Supérieure, France). Cosmology with gravitational waves.
  • Edwyn Howarth — Master's intern, Spring 2026 (Paris Sorbonne, France).
  • Seung-gyu Hwang | 황승규 — Yonsei University M.Sc. 2019–2021; Sejong post-Master's researcher 2022–2025. Gaussian process regression in cosmology. Now a PhD student at CosmoStat, CEA Saclay.
  • David Fernández Gil | 다비드 페르난데스 길 — Post-Master's researcher, 2022–2023. Alignment of AGN and galaxies (co-supervised with Jeff Hodgson, main supervisor). Now a PhD candidate at Centro de Estudios de Física del Cosmos de Aragón, Teruel, Spain.
  • Manal Ikram Bensahli — Undergraduate intern, Summer 2023. Information theory and Fermi light curves (ESTACA).
  • Seokhyeon Yu | 유석현 — B.Sc., 2022. Cosmological probes.
  • Sohee (Sophie) Chun | 전소희 — Emory University summer project, 2019. Type Ia supernova cosmology. Now a PhD candidate at Washington University in St. Louis, USA.