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Jonah Miller

@thephysicsmill.com
829 followers 464 following 173 posts

Computational astrophysicist at Los Alamos National Laboratory. Posts about #science, #software, #HPC, my #cats. Sometimes travel. Sometimes #mtg and #games. 🧪⚛️🔭 He/Him

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Jonah Miller @thephysicsmill.com · 04/05/2025
The halting problem is easy actually. The program will terminate when the computer breaks. Duh.
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Jonah Miller @thephysicsmill.com · 02/03/2025
My twin Lovecraftian horrors are back for #caturday #catsofbluesky #cat
Two black cats sitting in the windowsill looking at the camera
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Reposted by Jonah Miller
Crits For Cats, Inc. Cat Rescue @crits4cats.org · 17/02/2025
500 days— that’s how long Ash & Willow have been waiting for the right family. Can you help us find them? Learn more at crits4cats.petfinder.com (The .org in the thread doesn’t work properly).
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Jonah Miller @thephysicsmill.com · 16/02/2025
A very good blep. #cat #catsofbluesky
A black cat in a person's lap, looking at the camera with his widdle red tongue poking out
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Jonah Miller @thephysicsmill.com · 28/01/2025
We love sink #cat
A black cat sitting in a white sink looking up at the camera
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Jonah Miller @thephysicsmill.com · 21/01/2025
Me too guys. Me too. Source is "destroy all humans, they can't be regenerated" volume 2.
A panel from the manga "Destroy all Humans they can't be regenerated." It shows 3 people around a gaming table, looking overjoyed. Speech bubbles say "Ooh sounds great! I love drafts most of all."
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Jonah Miller @thephysicsmill.com · 20/01/2025
Slowly coming to terms with the fact that I'm not a science account that posts cats. I'm a #cat account that sometimes posts about science.
A black cat relaxing on a grey doughnut shaped bed looking at the camera. His name is Nyarlathotep.
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Jonah Miller @thephysicsmill.com · 18/01/2025
For this #caturday I present Emmy's beans. #cat #catsofbluesky
A grey cat lying on her side, looking up at the camera, with her paws in front of her
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Jonah Miller @thephysicsmill.com · 11/01/2025
Nyarlie and Yoggie ready for #caturday #cat #catsofbluesky
Two black cats arranged as mirror images of each other on a bookshelf
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Jonah Miller @thephysicsmill.com · 10/01/2025
Nyarlie is both a gentleman and a scholar. #cat #catsofbluesky
A black cat sitting in a bookshelf looking at the camera
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Jonah Miller @thephysicsmill.com · 10/01/2025
Paper day! This is a fun one if you like low level #hpc #programming hacks. 🧪🔭 In computational physics ⚛️, we often interpolate tabulated data that spans many orders of magnitude. A common way to do this is to tabulate in log space. But logs are slow... Or are they? 🧵👇 arxiv.org/abs/2501.05410
arxiv.org
Not-Quite-Transcendental Functions For Logarithmic Interpolation of Tabulated Data
From tabulated nuclear and degenerate equations of state to photon and neutrino opacities, to nuclear reaction rates: tabulated data is ubiquitous in computational astrophysics. The dynamic range that...
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Jonah Miller @thephysicsmill.com · 09/01/2025
I thought this article was very insightful for #programming in general, but also for scientific computing and #HPC 🔭⚛️🧪 www.seangoedecke.com/large-establ... Two underappreciated aspects 🧵👇
seangoedecke.com
Mistakes engineers make in large established codebases
What I've learned from ten years working on projects like this
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Jonah Miller @thephysicsmill.com · 04/01/2025
For this #caturday we have Emmy with heart melting eyes. #cat #catsofbluesky
Emmy, a gray cat looking up at the camera
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Jonah Miller @thephysicsmill.com · 03/01/2025
That's a funny looking book on the shelf... #cat #catsofbluesky
Yoggie looking out at new from his perch on the bookshelf
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Jonah Miller @thephysicsmill.com · 01/01/2025
Yoggie wishes you all a happy new year!
Yog-Sothoth in his tree, caught mid yawn so you can see his little teethies
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Jonah Miller @thephysicsmill.com · 31/12/2024
I ask sand to do math for me. Sometimes successfully.
Poorly explain what you do.
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Jonah Miller @thephysicsmill.com · 31/12/2024
I have interacted with undergraduate students who have never used anything other than a phone or tablet and don't know how to navigate a filesystem. The way most people interact with a computer is just different now, much as I am sad to admit it.
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Reposted by Jonah Miller
Laurence Datrier @asleepywanderer.bsky.social · 28/12/2024
Haven't seen this posted on here yet: applications for the 2025 LIGO International Physics and Astronomy (IPA) program for educators are open until the end of January! It's a fantastic* program for high school educators:) *(and I'm not only saying this cause I helped with it back in 2019😆) 🧪🔭
ligo.caltech.edu
International Physics & Astronomy Educator Program
Applications for the 2025 LIGO International Physics and Astronomy (IPA) program are now open!
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Jonah Miller @thephysicsmill.com · 28/12/2024
This week for #caturday I have two mirrored #cat s
Nyarlathotep and Yawgmoth in the windowsill looking spooky
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Jonah Miller @thephysicsmill.com · 26/12/2024
Absolutely devastated to discover I've become the kind of person who likes to work on vacation. Because no meetings or bureaucratic nonsense means it's way more productive and enjoyable.
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Jonah Miller @thephysicsmill.com · 21/12/2024
Well that's a strange looking #cat. #caturday #catsofbluesky
Our cat, Nyarlathotep looking out the window and trying to understand the deer sitting in our yard. It's a stare-off.
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Jonah Miller @thephysicsmill.com · 18/12/2024
My favorite git commit of the day. #programming #c++
A screenshot of a commit message on GitHub that reads "No GCC. You are wrong and I am right."
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Jonah Miller @thephysicsmill.com · 15/12/2024
For #scicomm Sunday this week, I thought I'd share the follow up to last week's article. This week, general relativity is the dynamics of distance 🧪⚛️🔭: www.thephysicsmill.com/2015/08/03/g...
thephysicsmill.com
General Relativity is the Dynamics of Distance
We know that gravity is the same as acceleration. General relativity tells us that this means gravity is the warping of distance.
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Jonah Miller @thephysicsmill.com · 14/12/2024
For this #caturday we have Emmy looking cozy in her doughnut. #cat #catsofblusky #blueskycats
Emmy looking cozy in her doughnut
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Jonah Miller @thephysicsmill.com · 13/12/2024
Too many moments to count. The biggest one, though, was being handed the exact right tools at the exact right time. I joined LANL September 2017. A certain neutron star merger was detected the month before... And I joined a research group incredibly strong in radiation transport and nuclear astro.
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Jonah Miller @thephysicsmill.com · 12/12/2024
The Well was featured in a LANL press release! This is a huge dataset designed for training scientific #AI and foundation models. The #HPC simulations of neutron star mergers, some of the most energetic events in the universe, we're my contribution. ⚛️🔭🧪👇 www.lanl.gov/media/news/1...
lanl.gov
Neutron star mergers contribute to AI training models | LANL
Neutron star merger simulations developed at Los Alamos National Laboratory are making important contributions to a collaborative initiative, Polymathic AI, which is training artificial intelligence m...
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Jonah Miller @thephysicsmill.com · 12/12/2024
We're shelved. #cat #catsofbluesky
Nyarlathotep watching me from the book shelf
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Jonah Miller @thephysicsmill.com · 11/12/2024
The more time I have spent in 🧪 at LANL, the more often I've had to communicate with intelligent folks who aren't technically trained in my field. These are the people who often set funding priorities and effectively communicating with them is an important skill, one that "popularizers" have honed.👇
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Jonah Miller @thephysicsmill.com · 11/12/2024
That (all too common) feeling when you get stuck in meetings all day so you only get to do the fun work (i.e., coding) after you get home and eat dinner...
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Jonah Miller @thephysicsmill.com · 10/12/2024
Hello new followers! You probably found me because of the pets starter pack. So let me pay the pet tax up front. This is Emmy, one of three of my three esteemed colleagues. Tune in to learn about the cool science we do. Supercomputers, supernovae, and neutron stars are just some of what we work on!
My esteemed colleague Emrakul Noether, showing her widdle fangs.
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Jonah Miller @thephysicsmill.com · 10/12/2024
The new Google quantum computer is very cool. But I can't help but be annoyed by the headlines about the absurd cost of the benchmark it ran. That's true, but the benchmark has no relation to problems we're actually interested in solving. Which is the big open problem in this space.
The goose chasing person meme. Asking whether or not the Google calculation did anything useful
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Jonah Miller @thephysicsmill.com · 10/12/2024
Spouse: what are you thinking about? Me: Thinking is hard and I did it all day. I'm tired. I'm done thinking for now.
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Jonah Miller @thephysicsmill.com · 09/12/2024
I am 100% on board with this idea.
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Jonah Miller @thephysicsmill.com · 09/12/2024
These are fantastic. Especially the first one. Everyone at all levels feels stupid all the time. And that means it's working.
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Jonah Miller @thephysicsmill.com · 08/12/2024
For #scicomm this Sunday, I figured I'd re-share some of my older prose that I'm still proud of. The first article in my series on general relativity for the lay person is this one: Galileo almost discovered general relativity. ⚛️🧪🔭 www.thephysicsmill.com/2015/07/26/g...
thephysicsmill.com
Galileo Almost Discovered General Relativity
We all know the story. Galileo dropped a bowling ball and a feather off of the Leaning tower of Pisa. But did you know this is a hint of general relativity?
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Jonah Miller @thephysicsmill.com · 07/12/2024
For #caturday this week, we have Emmie cuddling with her person. #cat #catsofbluesky
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Jonah Miller @thephysicsmill.com · 07/12/2024
It's even more incredible than that. We are also the aftermath of the deaths of colliding stars, and the embers of the first primordial plasma.
Periodic table of elements showing the cosmic origins of each element. Credit to NASA and Jennifer Johnson. 
https://svs.gsfc.nasa.gov/13873/
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Jonah Miller @thephysicsmill.com · 07/12/2024
I have a whole talk called "performance portability is a lie." It's basically talking about this issue. If you want to be performant on both traditional CPU architectures and modern accelerators, you need algorithm and data structure "knobs" you can turn to adapt to moving bottlenecks. #hpc
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Jonah Miller @thephysicsmill.com · 06/12/2024
Pleased that I once again got to share the gospel of log plots in #astrophysics with a new generation today.
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Reposted by Jonah Miller
Jesse Capecelatro @jessecaps.bsky.social · 05/12/2024
Big things ahead at the University of Michigan! U-M and Los Alamos are teaming up to build next-generation #HPC facility for #AI research record.umich.edu/articles/u-m...
record.umich.edu
U-M, Los Alamos to develop AI research facility in Michigan | The University Record
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Jonah Miller @thephysicsmill.com · 05/12/2024
@bot.astronomy.blue signup
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Jonah Miller @thephysicsmill.com · 04/12/2024
This is the only acceptable position for drinking from the faucet, apparently. #cat #catsofbluesky
Yoggie having a drink but weird because he's a cat.
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Jonah Miller @thephysicsmill.com · 03/12/2024
Hi @physgal.bsky.social , would it be possible to add me to the physicists list?
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Jonah Miller @thephysicsmill.com · 03/12/2024
Last year I had to fly defuse a situation where a new contributor felt attacked for their contributions on an MR. That motivated me to set up expectations for both reviewer and contributor on a pull request. Here's what I wrote up lanl.github.io/singularity-...
lanl.github.io
Contributing — Singularity-EOS documentation
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Jonah Miller @thephysicsmill.com · 03/12/2024
I'm honored my simulations are featured as part of this amazing toolbox for training scientific AI and foundation models. Hopefully this dataset will help drive innovation in ML for science. 🧪 polymathic-ai.org/the_well/
polymathic-ai.org
The Well
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Jonah Miller @thephysicsmill.com · 02/12/2024
Talking numerical methods with @arvindmohan.bsky.social in our second, better office
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Reposted by Jonah Miller
Davide De Biasio @davidedebiasio.bsky.social · 22/11/2024
Scientists, when do we start lobbying for #Bluesky to implement native LaTeX support? #science #physics #mathematics 🧪⚛️
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