Tony Salvi
Tony Salvi

Postdoc in Mathematics

Institut de Mathématiques de Jussieu Sorbone Université
4 place Jussieu 75005 Paris – France – tsalvi AT imj-prg.fr

Research Topics

My research topic is the study of partial differential equations arising from physics, mainly relativistic ones. More precisely, I am interested in understanding complex phenomena and deriving effective dynamics at the limit between different scales of description (high-frequency limits, long-time asymptotic behavior…) and different physical paradigms (quantum, classical, and relativistic physics).

In my thesis, I looked at the behavior and limit of two types of high-frequency solutions to the Klein-Gordon-Maxwell (KGM) and the nonlinear Klein-Gordon (NLKG) equations. The first type of high-frequency solutions led me to prove an equivalent of the Burnett conjecture (originally stated for the Einstein equations) for the KGM equations, while the second type, which corresponds to the semi-classical limit, allowed me to derive relativistic hydrodynamics from both the KGM and NLKG equations. For this reason, the study of relativistic fluid or kinetic equations as well as the Einstein equations is also of great interest to me. The main tools I used for these works were semi-classical analysis, WKB analysis, and the modulated energy method. Overall, I like to adapt classical methods to the relativistic setting.


Here is the list of talks I gave :

February 2026

Seminar PM-EDP (Mathematical physics and PDE) in LAGA at Université Paris 13

January 2026

Conference talk at Journées des Jeunes EDPistes en France at Université Paris Dauphine-PSL

November 2025

PDE Seminar in Institut de Mathématiques de Bordeaux at Université de Bordeaux

November 2025

Analysis Seminar in Laboratoire de Mathématiques Jean Leray at Université de Nantes

July 2025

Seminar on Mathematical General Relativity at Laboratoire Jacques-Louis Lions in Sorbonne Université UPMC

March 2025

PhD students’ Colloquium, at Département de Mathématiques et Applications in École Normale Supérieure

February 2025

PhD students’ Seminar in Analysis at Laboratoire de mathématiques d’Orsay in Université Paris-Saclay

January 2025

Probability, Mathematical Physics, and Analysis Seminar at LAREMA in Université d’Angers

January 2025

PDE Seminar at IRMAR in Université de Rennes

December 2024

Reading group on general relativity at Laboratoire Jacques-Louis Lions in Sorbonne Université UPMC

November 2024

PDE Seminar at the Department of Mathematics and Applied Mathematics at the
University of Crete

June 2024

Journée des doctorants du CMLS at École polytechnique

I also often go to the Laurent Schwartz Seminar at École Polytechnique and Institut des Hautes Études Scientifiques, as well as to the Seminar on Mathematical General Relativity at Laboratoire Jacques-Louis Lions.

Here is a list of some conferences I attended :

January 2026

Journées des Jeunes EDPistes en France at Université Paris Dauphine-PSL

June 2025

LICHNEROWICZ CONFERENCE — Journées Relativistes at Institut Henri Poincaré

May 2025

Journées CY Analyse non linéaire 2025 at CY Advanced Studies

September 2024

Aspects of cosmology, mathematics and physics at École polytechnique

June 2024

Nonlinear Waves and Fluids at University College London

April 2024

Curved spacetimes, field theory and beyond at Institut Henri Poincaré

May 2024

Turbulent·e·s Conference at École polytechnique

May 2024

Semiclapp: Semiclassical analysis and applications at Université Côte d’Azur

December 2024

SALVE Winter School a École Normale Supérieure

June 2023

New Trends in Mathematical Fluid Dynamics at Université Grenoble Alpes

January 2024

Conférence itinérante du GDR Analyse des équations aux dérivées partielles at Université de Nantes

March 2022

Aspects of Gravity Mathematics and Physics at École Polytechnique

February 2022

Conférence itinérante du GDR Analyse des équations aux dérivées partielles in Vannes