Ruben Zeitoun

 

About Me

I am a postdoctoral researcher at "Laboratoire d'optique appliquée (LOA)" under the supervision of Dr. Stéphane Sebban since November 2025 on "Modeling of experiments of quantum field theory with lasers".

I defended my PhD in Mathematics titled "Spectral action and the resolvent of the wave operator on asymptotically de Sitter" in September 2025 under the supervision of Prof. Michal Wrochna.

My research interests are in Mathematical Physics, more preciselly in partial differential equations and the Mathematics and applications of Quantum Field Theory in curved spacetime. This includes microlocal analysis, semi-classical analysis and spectral theory.

My Curriculum Vitae :

My english CV.

Contact Details:

Address: Laboratoire d'optique appliquée, 181 chemin de la Hunière, 91120 Palaiseau, France.

Office: D.1.06.

Email: firstname.lastname[at]ensta.fr

firstname=ruben, lastname=zeitoun

Publications and preprints

1.Feynman spectral action of the wave operator on asymptotically de Sitter spaces, arXiv:2511.17359, 2025 preprint.

2. Torsion and Lorentz symmetry from Twisted Spectral Triples, (with  P. Martinetti and G. Nieuviarts) arXiv:2401.07848v5, 2024 preprint .

3.The wave resolvent for compactly supported perturbations of static spacetimes. (with M. Wrochna) In Harmon. Anal. Partial Differ. Equations, pages 1–17. 2022. 

Conferences and workshops

• Invited speaker, “General relativity working group”, Paris, France, February 26th, 2024.

• Invited speaker, “Meeting in spectral theory”, Groningen-Oldenburg-Utrecht University, Netherlands, February 16th, 2024.

• Invited speaker, “Seminar of mathematical physics”, Paris, France, October 17th, 2023.

• International conference: “Spectral Theory and Mathematical relativity”, Vienna, Austria, June, 2023.

• International conference: “Quantum effects induced by geometry”, Freiburg im Breisgau, Germany, July 7th-8th 2022.         

• International conference: “Aspects of Gravity, mathematics and Physics”, Paris, France, March  2022. 

• “General relativity workshop”, Paris, France, 2022.

Education:

MsC in theoretical Physics (2021) from International Center for Fundamental Physics (ICFP) at ENS-PSL.

Msc in fundamental Mathematics (2020) from Sorbonne université.