Matthieu Schaller
@mschaller.bsky.social
Lecturer in numerical cosmo @ LION+STRW Leiden University. Lead dev. of @swiftsimulation.bsky.social astro and cosmology code. #HPC. Creator of fake universes; all including cheese. 🇨🇭
www.matthieuschaller.com
www.matthieuschaller.com
Pinned
Experiment shows the Universe is squishy and soft.
November 1, 2025 at 11:39 AM
Experiment shows the Universe is squishy and soft.
This year's SWIFTcon crowd gathering in Leiden to discuss all things simulations and HPC going from planets to the whole Universe.
October 23, 2025 at 11:49 AM
This year's SWIFTcon crowd gathering in Leiden to discuss all things simulations and HPC going from planets to the whole Universe.
Reposted by Matthieu Schaller
Cosmologists! We have a faculty job going here in Oxford - happy to answer questions. Brief version is that this remains a great & collaborative place to do science and the students are superb. 🔭 www.jobs.ac.uk/job/DOP628/a...
Associate Professor of Cosmology at University of Oxford
Recruiting now: Associate Professor of Cosmology on jobs.ac.uk. Click for details and explore more academic job opportunities on the top job board
www.jobs.ac.uk
October 14, 2025 at 9:16 AM
Cosmologists! We have a faculty job going here in Oxford - happy to answer questions. Brief version is that this remains a great & collaborative place to do science and the students are superb. 🔭 www.jobs.ac.uk/job/DOP628/a...
Pittsburgh's cathedral of learning has switched on the batsignal to gather all the world's cosmologists ahead of next week's conference.
October 12, 2025 at 1:16 AM
Pittsburgh's cathedral of learning has switched on the batsignal to gather all the world's cosmologists ahead of next week's conference.
One especially nice result from @swiftsimulation.bsky.social -based simulations run by students attending the Ex-Gal galaxy simulation summer school in Durham last week.
September 22, 2025 at 2:07 PM
One especially nice result from @swiftsimulation.bsky.social -based simulations run by students attending the Ex-Gal galaxy simulation summer school in Durham last week.
Sometimes, we have to go to the computer room and push the bytes around in the machine by hand.
September 19, 2025 at 4:53 PM
Sometimes, we have to go to the computer room and push the bytes around in the machine by hand.
Reposted by Matthieu Schaller
📢Leiden Institute of Physics (LION) is #hiring a faculty member in experimental quantum physics (tenure-track, Asst. Prof. level, higher possible). Join us in exploring the limits of #quantummechanics! Apply by Oct 5, 2025 👉 edu.nl/hyt88
September 5, 2025 at 8:55 AM
📢Leiden Institute of Physics (LION) is #hiring a faculty member in experimental quantum physics (tenure-track, Asst. Prof. level, higher possible). Join us in exploring the limits of #quantummechanics! Apply by Oct 5, 2025 👉 edu.nl/hyt88
Spending the day at LJMU for the 5 year anniversary of their computing centre.
The conference room alone is worth the trip.
The conference room alone is worth the trip.
September 3, 2025 at 11:24 AM
Spending the day at LJMU for the 5 year anniversary of their computing centre.
The conference room alone is worth the trip.
The conference room alone is worth the trip.
Reposted by Matthieu Schaller
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
September 1, 2025 at 8:59 AM
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
Reposted by Matthieu Schaller
The sophisticated COLIBRE simulations finally land on the arXiv: arxiv.org/abs/2508.21126. Treating these with sonification, we can get new intuition for galaxy evolution to augment our visuals. Sound on for the explainer vid, visit the site for more! colibre.strw.leidenuniv.nl/videos.html 🔭🧪
September 1, 2025 at 2:24 PM
The sophisticated COLIBRE simulations finally land on the arXiv: arxiv.org/abs/2508.21126. Treating these with sonification, we can get new intuition for galaxy evolution to augment our visuals. Sound on for the explainer vid, visit the site for more! colibre.strw.leidenuniv.nl/videos.html 🔭🧪
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
September 1, 2025 at 8:59 AM
The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out!
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
This is the culmination of years of work by a large team.
The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations.
(Sound on!)
Reposted by Matthieu Schaller
A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps.
@solarcan.bsky.social
@solarcan.bsky.social
July 19, 2025 at 10:03 AM
A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps.
@solarcan.bsky.social
@solarcan.bsky.social
A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps.
@solarcan.bsky.social
@solarcan.bsky.social
July 19, 2025 at 10:03 AM
A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps.
@solarcan.bsky.social
@solarcan.bsky.social
Reposted by Matthieu Schaller
Über 150 internationale Wissenschaftlerinnen und Wissenschaftler diskutieren diese Woche am AIP beim 18. Potsdamer Thinkshop. Der Thinkshop mit dem Titel „The Role of Feedback in Galaxy Formation“ bietet Raum für neue Ideen und interdisziplinäre Zusammenarbeit. 💫
#astrophysics #galaxy #potsdam
#astrophysics #galaxy #potsdam
July 17, 2025 at 12:36 PM
Über 150 internationale Wissenschaftlerinnen und Wissenschaftler diskutieren diese Woche am AIP beim 18. Potsdamer Thinkshop. Der Thinkshop mit dem Titel „The Role of Feedback in Galaxy Formation“ bietet Raum für neue Ideen und interdisziplinäre Zusammenarbeit. 💫
#astrophysics #galaxy #potsdam
#astrophysics #galaxy #potsdam
Reposted by Matthieu Schaller
Take a whistle stop tour of @esa.int’s Euclid mission exhibit at this year’s GoodWood #FestivalOfSpeed with James, an Outreach Co-ordinator at The University of Edinburgh… (1/6) 🧵
July 13, 2025 at 8:19 AM
Take a whistle stop tour of @esa.int’s Euclid mission exhibit at this year’s GoodWood #FestivalOfSpeed with James, an Outreach Co-ordinator at The University of Edinburgh… (1/6) 🧵
@runningastronomer.bsky.social gets the universe back on track for day 3 at the Goodwood festival of speed
July 12, 2025 at 7:04 AM
@runningastronomer.bsky.social gets the universe back on track for day 3 at the Goodwood festival of speed
The universe is in progress
July 12, 2025 at 5:47 AM
The universe is in progress
Reposted by Matthieu Schaller
We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers.
The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
July 10, 2025 at 7:47 PM
We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers.
The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
UK astronaut Tim Peake is being introduced to the mysteries of the Universe via our @swiftsimulation.bsky.social code running a live simulation
July 10, 2025 at 2:36 PM
UK astronaut Tim Peake is being introduced to the mysteries of the Universe via our @swiftsimulation.bsky.social code running a live simulation
Being rude is how we defeat the machines
Adding the word ‘fucking’ to your Google search query disables the unwanted AI summary at the top of the results page.
June 5, 2025 at 6:26 AM
Being rude is how we defeat the machines
Reposted by Matthieu Schaller
Adding the word ‘fucking’ to your Google search query disables the unwanted AI summary at the top of the results page.
June 2, 2025 at 9:22 AM
Adding the word ‘fucking’ to your Google search query disables the unwanted AI summary at the top of the results page.
Simulated galaxies from the new model are 🤩🤩
May 24, 2025 at 1:59 PM
Simulated galaxies from the new model are 🤩🤩
Seminar today at the Oskar Klein Center in Stockholm
May 13, 2025 at 6:25 AM
Seminar today at the Oskar Klein Center in Stockholm
Utrecht physics theory group consumes enough pizza that they have dedicated garbage bins
May 9, 2025 at 3:46 PM
Utrecht physics theory group consumes enough pizza that they have dedicated garbage bins