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Highlights

Selected highlights of my research and outreach activities.

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  Oxford's Port Meadow on a rare sunny winter day
  31-03-2026

  Hello Oxford!

  I have now joined the University of Oxford as a Royal Society Newton International Fellow. It is a joy to be part of one of the oldest universities in the world! During my fellowship, I will focus on fully establishing my role within the Euclid Consortium, performing lots of interesting tests of the laws of gravity at cosmological scales, and studying pulsar timing arrays in combination with other probes of our Universe. Oxford is a fantastic city beyond its University too — I particularly enjoy all the century-old pubs, and the beautiful nature in and around the city.

  Click here for the Royal Society's press release on the Newton International Fellowships awarded in 2025
• 
  03-11-2025

  Dark matter and the cosmic tower of Pisa

  In the late 16th century, Galileo Galilei argued that if two objects of different masses were dropped from the Leaning Tower of Pisa, they would hit the ground at the same time. This demonstrated that gravity pulls on all objects equally. But is this also true for dark matter? While we cannot grab a dark matter particle and throw it down from a tower, galaxy surveys can help us test the properties of dark matter across vast distances. In a recent publication in Nature Communications, I demonstrate how we can use gravitational lensing, together with the motion of galaxies, to test whether dark matter behaves like standard particles under gravity. So far, we do not see any indication that dark matter is subject to any fifth force. However, better cosmological data in the near future will help refine our understanding of the properties of dark matter and gravity.

  Click here for the press release by the University of Portsmouth
• 
  18-08-2025

  Starting a new chapter in the UK

  After a long time in different parts of Switzerland, I have now arrived in the United Kingdom to work as a research fellow at the Institute of Cosmology and Gravitation, University of Portsmouth. Not going to lie, getting to this point was exhausting! The past year or so certainly had many ups and downs, and I should probably start writing blog posts about handling the uncertainties of the academic job market while having a small child and a two-body-problem to solve. Until I find time for that (which might or might not happen), all I can say is that I am now delighted about the outcome of my perseverance, having a great scientific environment and also lots of new places to explore in the UK.

  I'm currently a member of the ICG Portsmouth.
• 
  13-06-2025

  CosmoFONDUE: The world's tastiest cosmology conference

  Together with four of my colleagues at the University of Geneva, we have organised the amazing CosmoFONDUE conference. The conference name stands for Cosmological Fundamental Observables and Novel Discoveries in the Universe (a quite good backronym, if you ask me). We had the vision to bring both leading experts and junior scientists from various areas of cosmology together, and encourage discussions across research fields and across generations of researchers. And I believe we have been fantastically successful in doing so! CosmoFONDUE is the first (and hopefully not last) conference that I co-organized, and I'm happy to say that it went very smoothly.

  The conference website can be found here.
• 
  20-01-2025

  A precision test of general relativity

  Combining different cosmological observables can be a powerful way of testing physics beyond the standard model of cosmology. More specifically, in my recent first-author publication in Physical Review Letters, I have demonstrated how measurements of galaxy velocities and of the Weyl potential can be combined to reconstruct the so-called E_G statistic as a robust test of gravity. This new method for measuring the E_G statistic significantly surpasses the precision of previous literature values.

  Click here for the report published by my University
• 
  20-11-2024

  Media attention for the Weyl potential evolution

  In a recent Nature Communications paper, we have presented a measurement of the Weyl potential evolution from the first three years of Dark Energy Survey data. This novel observable offers promising prospects to test Einstein's law of general relativity at the scales of our cosmos, a topic which the general public seems to be quite curious about: our results have been shared by ScienceDaily (English), RTS (French), Focus Online and Der Standard (German), and many more!

  Click here for the University press release
• 

  Image Credit: IIL
  24-04-2024

  Outreach talk at Institut International de Lancy

  I had the pleasure to give an outreach talk at the Institut International de Lancy in the context of the International Day of Women and Girls in Science. The goal was to explain some key concepts, such as why we know that the Universe is expanding. I very much enjoyed the interactions with the pupils, in particular the interview for the school web radio that they invited me to do. If you would like me to give an outreach talk at your school or organization, feel free to contact me, and I will try to fit it into my schedule!

  Click here for my interview in the school web radio
• 
  03-04-2024

  New outreach video on the Weyl potential evolution

  In a new video on the Cosmic Blueshift YouTube channel, we (my collaborator Isaac Tutusaus, my boss Camille Bonvin, and I) explain our newest work on the Weyl potential evolution, and model-independent measure to test the laws of gravity at cosmological scale. We find a mild tension of 2.8 sigma with the standard cosmological model. What does all of this mean, and what do we expect from future surveys? Check our video to find out more (it's in French, but English subtitles are available).

  Click here to find our outreach video