Physics/Mathematics/Computer Science

Beyond Calibration: Links to Algorithmic Fairness and Impact in Decision-Making

As machine learning is seeping into all strata of modern societies, it is increasingly used to automate decisions or draw conclusions.…

Producing Extreme Light Intensities with Relativistic Plasma Mirrors

Multi-petawatt laser facilities, such as Apollon in Paris, will generate very high light intensities to explore novel strong-field…

Experimental Studies of Strong-field Quantum Electrodynamics

When a very intense laser collides with a highly energetic electron beam, gamma rays are emitted. Together with the extremely high…

Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions

Intense sources of high-energy gamma-ray photon beams are of great interest for scientific endeavors in fundamental and applied sciences…

Accurate and Efficient New Numerical Methods for Fluid Models in Plasma Physics

Electric propulsion for satellites is a technology that largely reduces the launch costs and provides reliable orbit control capabilities. Nevertheless, the design and…

Pushing the Limits of Audio Spatialization with Emerging Architectures

Spatial audio refers to various systems and techniques used to diffuse sound sources or sound fields in space. While “surround sound” systems which are present in many homes…

Towards Predictive Fluid Modeling of Plasma Processing Applications

Low-temperature plasmas have multiple vital scientific and industrial applications, including plasma processing, electric propulsion, arc discharges, and…

Developing a Real-Time Cancer Cell Tracking Algorithm for Cancer Patients

A major health challenge our societies are about to face on the long-term is cancer, as it is already the primary cause of death in France and the second one in the US. As a…

High-Moment Simulations for Low-Temperature Plasmas

The physics of ionized gases, or plasmas, gives rise to a great variety of fascinating phenomena like northern lights or solar flares. In particular…

Advanced Diagnostics for Astrophysical Beam-Plasma Experiments in the Laboratory

The interaction of highly energetic particles with plasmas plays a major role in the evolution of the universe and gives rise to many…

Fairness for Data Analysis

Automated decisions are taking a prominent place in our societies in various domains ranging from medical diagnosis, to justice decisions or college…

Magnetic Probe Diagnostic Simulation

Calibration for a Next-generation Gamma-ray Camera

Towards Structurally Characterizing Protein-RNA Interactions With Kino-geometric Sampling

Biomolecules such as protein and RNA are flexible to form complexes and perform their cellular function. Advances in X-ray crystallography, in particular the capabilities of…

Medical Records Data and the Semantic Web to Monitor Drug Uses

The widespread use of patient Electronic Health Records in hospitals generates large volumes of data offering exciting opportunities for novel discoveries in medicine.…

Beyond Calibration: Links to Algorithmic Fairness and Impact in Decision-Making

As machine learning is seeping into all strata of modern societies, it is increasingly used to automate decisions or draw conclusions. However, myriads of recent examples have revealed patent discrimination: Flickr’s and Google Photos’ image labeling in 2015 [1], recidivism risk assessment with COMPAS in 2016 [2], Amazon’s job application review in 2018 [3], Twitter’s image cropping in 2020 [4], DALL-E image generator in 2021 [5], etc. All displayed strong ethnic or gender biases.

Producing Extreme Light Intensities with Relativistic Plasma Mirrors

Multi-petawatt laser facilities, such as Apollon in Paris, will generate very high light intensities to explore novel strong-field frontiers in plasma- and laboratory astrophysics. Relativistic plasma mirrors represent a promising technology to significantly boost the peak laser intensity by utilizing highly nonlinear light-plasma interactions that happen at the mirror surface. The objective of my research is to numerically simulate these laser-plasma interactions to understand how they impact the maximum laser intensities that can be achieved.

Extremely Dense Gamma-Ray Pulses in Electron Beam-Multifoil Collisions

Intense sources of high-energy gamma-ray photon beams are of great interest for scientific endeavors in fundamental and applied sciences such as probing the limits of the Standard Model of particle physics, as well as for applications in industry, medicine, and material science. However, existing photon sources are extremely limited in photon intensity at these high energies.

Accurate and Efficient New Numerical Methods for Fluid Models in Plasma Physics

Electric propulsion for satellites is a technology that largely reduces the launch costs and provides reliable orbit control capabilities. Nevertheless, the design and development of plasmas thrusters is still semi-empirical and involves long and expensive life tests due to the complex, nonlinear physics of low-temperature plasmas, making its study an active field of research. In this project I will be collaborating with Prof. Ken Hara to develop innovative models and numerical methods to study the onset of plasma instabilities in magnetized configurations.

Pushing the Limits of Audio Spatialization with Emerging Architectures

Spatial audio refers to various systems and techniques used to diffuse sound sources or sound fields in space. While “surround sound” systems which are present in many homes typically involve 5 to 7 speakers, more advanced techniques such as Ambisonics and Wave Field Synthesis (WFS) imply the use of a much greater number of speakers. Those techniques are very efficient to recreate sound spatialization and are of high interest in fields like virtual and augmented reality, acoustic of concert room, archeoacoustics, etc.

Towards Predictive Fluid Modeling of Plasma Processing Applications

Low-temperature plasmas have multiple vital scientific and industrial applications, including plasma processing, electric propulsion, arc discharges, and many more. Plasmas exhibit complex phenomena in a wide range of both spatial and temporal scales, spanning frequencies from gigahertz to kilohertz and length scales from microns to meters.

Developing a Real-Time Cancer Cell Tracking Algorithm for Cancer Patients

A major health challenge our societies are about to face on the long-term is cancer, as it is already the primary cause of death in France and the second one in the US. As a way to tackle it, one of the most used techniques nowadays is radiotherapy. It uses high-dose radiations to kill cancer cells detected with medical imaging. Yet, as cancer can be located in sensitive areas, and in a bid to protect surrounding healthy tissues, radiations must be precise and directional.

Advanced Diagnostics for Astrophysical Beam-Plasma Experiments in the Laboratory

The interaction of highly energetic particles with plasmas plays a major role in the evolution of the universe and gives rise to many astrophysical processes that are not yet fully understood. Our collaboration, consisting of groups from France and the USA, aims at creating these processes within a laboratory, which permits a high degree of control and insight into parameters that are otherwise not accessible.