Romain Teyssier

Romain Teyssier is a French computational astrophysicist[1] known for his work on cosmology,[2] galaxy formation, star formation, and numerical fluid dynamics.[3] He is Professor of Astrophysical Sciences and Applied and Computational Mathematics at Princeton University.[4]

Teyssier is the principal author of RAMSES, an Adaptive Mesh Refinement (AMR) code[5] for modeling self-gravitating, magnetized, and radiative astrophysical flows.[6]

He received the 2011 Grand Prix Scientifique of the Simone and Cino Del Duca Foundation of the French Academy of Sciences.[7]

Education and career

Teyssier studied at École Polytechnique before completing a master’s degree and PhD in astrophysics at Paris Cité University.[8]

After completing his PhD, he held a postdoctoral position at Lawrence Livermore National Laboratory from 1997 to 1998, working with Bruce Remington.[9] He then joined CEA Saclay as a junior researcher in 1998, later becoming a senior researcher in 2006, a position he held until 2013. During this period, he led and contributed to computational astrophysics projects, including the Horizon and COAST initiatives.[10]

In 2013, Teyssier was appointed associate professor in Computational Astrophysics at the University of Zürich, where he later became full professor and served as director of the Institute for Computational Science.[11] In 2021, he joined Princeton University as Professor of Astrophysical Sciences and Applied and Computational Mathematics, where he research on galaxy formation, star formation, and large-scale cosmological simulations.[12]

Research

Teyssier conducts research in numerical cosmology, baryonic physics in galaxy formation, star-formation processes, and plasma and magnetohydrodynamics.[13] He has played roles in international simulation programmes, including the Horizon and COAST projects, and co-leads the Cosmological Simulation Working Group of the Euclid Consortium, contributing to weak-lensing and galaxy-clustering modelling.[14] His recent work also supports simulations for observations with the James Webb Space Telescope[15] and cosmological science with the Nancy Grace Roman Space Telescope.[16]

Teyssier is the lead developer of the RAMSES adaptive-mesh-refinement code, widely used to model self-gravitating, magnetised and radiative flows.[17] Using large-scale numerical simulations, he studies galaxy and star formation across a wide range of spatial scales, from individual stellar systems to the large-scale structure of the Universe, and has advanced understanding of how gas dynamics and feedback from supermassive black holes shape galaxy morphology and evolution.[5][6]

At the University of Zurich, he led a team that produced virtual universes, modelling around 25 billion galaxies with two trillion particles to generate a reference galaxy catalogue for the Euclid mission of the European Space Agency.[18]

Selected publications

References

  1. ↑ Stephens, Tim. "Astrophysicists launch ambitious assessment of galaxy formation simulations". Archived from the original on 2024-05-14. Retrieved 2026-02-19.
  2. ↑ Hays, Brooks. "Scientists simulate largest-ever virtual universe "The nature of dark energy remains one of the main unsolved puzzles in modern science," said researcher Romain Teyssier". UPI. Retrieved 2026-02-19.
  3. ↑ Lant, Karla (2017-06-14). "The Largest Virtual Universe Ever Created Was Just Simulated in a Supercomputer". Futurism. Retrieved 2026-02-19.
  4. ↑ "Distinguished Cosmologist/Fluid Dynamicist Romain Teyssier to Join Princeton Faculty | Department of Astrophysical Sciences". web.astro.princeton.edu. Retrieved 2026-02-19.
  5. 1 2 "The RAMSES code". The Particle Physics Division. Retrieved 2026-02-19.
  6. 1 2 Moseley, Eric R.; Teyssier, Romain; Draine, B. T. (2022-10-28), "Dust dynamics in ramses – I. Methods and turbulent acceleration", Monthly Notices of the Royal Astronomical Society, 518 (2): 2825–2844, arXiv:2204.07681, doi:10.1093/mnras/stac3231
  7. ↑ "Honors and Distinctions in 2011". www.mnf.uzh.ch. Retrieved 2026-02-19.
  8. ↑ "Romain Teyssier reçoit le grand prix scientifique 2011 de la Fondation..." www.aefinfo.fr (in French). Retrieved 2026-02-19.
  9. ↑ Davis, Victoria (2025-11-04). "From The Program Chair". Amateur Astronomers Association of Princeton. Retrieved 2026-02-19.
  10. ↑ "Romain Teyssier - Polytechnique 1989 | Association des anciens élèves et diplômés de l'École polytechnique - AX". AX POLYTECHNIQUE. Retrieved 2026-02-19.
  11. ↑ Miller, Stephen. "The Largest Virtual Universe Ever Simulated". Lab Manager. Archived from the original on 2025-07-13. Retrieved 2026-02-19.
  12. ↑ "Professor Romain Teyssier to Join Princeton Faculty | The Program in Applied & Computational Mathematics". www.pacm.princeton.edu. 2020-09-29. Retrieved 2026-02-19.
  13. ↑ Girma, Eden; Teyssier, Romain (2023-11-27). "A new star formation recipe for magnetohydrodynamics simulations of galaxy formation". Monthly Notices of the Royal Astronomical Society. 527 (3): 6779–6794. doi:10.1093/mnras/stad3640. ISSN 0035-8711.
  14. ↑ "STARs2018 – Euclid Consortium". Retrieved 2026-02-19.
  15. ↑ Mauerhofer, Valentin; Dayal, Pratika; Haehnelt, Martin G.; Kimm, Taysun; Rosdahl, Joakim; Teyssier, Romain (2025-04-01). "Synergising semi-analytical models and hydrodynamical simulations to interpret JWST data from the first billion years". Astronomy & Astrophysics. 696: A157. arXiv:2502.02647. Bibcode:2025A&A...696A.157M. doi:10.1051/0004-6361/202554042. ISSN 0004-6361.
  16. ↑ "Observational Facilities The Nancy Grace Roman Space Telescope will be a 2.4-meter wide-field imaging telescope w". web.astro.princeton.edu. Retrieved 2026-02-19.
  17. ↑ Teyssier, R. (2002-04-01). "Cosmological hydrodynamics with adaptive mesh refinement - A new high resolution code called RAMSES". Astronomy & Astrophysics. 385 (1): 337–364. arXiv:astro-ph/0111367. Bibcode:2002A&A...385..337T. doi:10.1051/0004-6361:20011817. ISSN 0004-6361.
  18. ↑ Lu, Donna. "Massive simulation of the universe shows how galaxies form and die". New Scientist. Retrieved 2026-02-19.
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