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
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.
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.
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.
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!)
Same data but with a slightly different processing of the colours
July 19, 2025 at 10:04 AM
Same data but with a slightly different processing of the colours
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
@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
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
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
New paper on the arXiv based on our cosmological simulation work!
Link: arxiv.org/abs/2504.15633
We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data
Link: arxiv.org/abs/2504.15633
We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data
April 24, 2025 at 7:26 AM
New paper on the arXiv based on our cosmological simulation work!
Link: arxiv.org/abs/2504.15633
We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data
Link: arxiv.org/abs/2504.15633
We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data
That' as much as we'll get here
March 29, 2025 at 11:23 AM
That' as much as we'll get here
New career development opportunity
March 24, 2025 at 7:28 PM
New career development opportunity
Beautiful sunset over the Sidney harbour bridge and Opera house tonight. Or almost.
March 19, 2025 at 6:32 PM
Beautiful sunset over the Sidney harbour bridge and Opera house tonight. Or almost.
Wasabi: the classic Irish condiment
March 17, 2025 at 6:20 PM
Wasabi: the classic Irish condiment
Virtual galaxy from our new model 🤩
March 13, 2025 at 6:16 PM
Virtual galaxy from our new model 🤩
Graduation time for our master students at Leiden Observatory!
February 28, 2025 at 3:24 PM
Graduation time for our master students at Leiden Observatory!