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Abbas K. Rizi

@abbasrizi.bsky.social
345 followers 494 following 98 posts

Networks, Epidemics & Social Behavior Postdoc Researcher at DTU Compute & SODAS 🇩🇰 Editor-in-chief & Science Writer at sitpor.org abbas.sitpor.org

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Abbas K. Rizi @abbasrizi.bsky.social · 16h
Now that AI is messing with mathematicians, much of the debate revolves around “understanding,” while the old fascination with “beauty” seems to have faded. But if mathematical beauty is an aesthetic ideal masquerading as an epistemic one, how much more precise is our notion of understanding?
From https://terrytao.wordpress.com/2026/10/09/what-mathematicians-should-know-about-the-lean-theorem-proverquestions-of-reliability-and-ai/from here:
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NetScience @netscience.bsky.social · 06/10/2026
Disentangling epidemics and percolation arxiv.org/abs/2610.03573
arxiv.org
Disentangling epidemics and percolation
Non-recurrent epidemics on complex networks, such as the paradigmatic susceptible-infected-recovered (SIR) model, are often studied by mapping the model to bond percolation. However, the conditions un...
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Abbas K. Rizi @abbasrizi.bsky.social · 01/10/2026
Until that happens, it is important to give humans the credit they deserve, since careers can depend on it, but that will soon cease to be the case as well." Tim Gowers gowers.wordpress.com/2026/09/17/w...
gowers.wordpress.com
Why I didn’t sign the Fields medallists’ letter
[This post has been cross-posted to Terence Tao’s blog.] When I was around 11 I heard for the first time about Fermat’s Last Theorem. I was immediately captivated by the problem stateme…
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Abbas K. Rizi @abbasrizi.bsky.social · 01/10/2026
"[with the advancement of AI] Very soon, the whole “credit system” will surely collapse, since finding an amazing proof will be no more of an intellectual achievement than when a citizen scientist spots through their telescope an object that turns out to be a new comet.
gowers.wordpress.com
Why I didn’t sign the Fields medallists’ letter
[This post has been cross-posted to Terence Tao’s blog.] When I was around 11 I heard for the first time about Fermat’s Last Theorem. I was immediately captivated by the problem stateme…
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Abbas K. Rizi @abbasrizi.bsky.social · 01/10/2026
"Try to learn something about everything and everything about something." Thomas Huxley
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Melanie Mitchell @melaniemitchell.bsky.social · 08/09/2026
Hey @ericlipton.nytimes.com 👋 AI is not “evolving” on its own. *People* are choosing how to build it. *People* are choosing how to train it. *People* are choosing how to run it. Maybe the problem is that they are the *wrong people* to make these choices.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/08/2026
Thanks for the visit, Carl! It really was such a lovely and memorable day. Looking forward to many more birding adventures together :)
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Abbas K. Rizi @abbasrizi.bsky.social · 10/08/2026
Kalvebod Fælled is a really nice option, only about half an hour from the center + 🚲. Around Klydesøen and the bird tower, there are some lovely spots. I cycle there quite often and always see people birdwatching. I’d be happy to join you if you fancy it! (Not a professional birdwatcher tho 😄)
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Abbas K. Rizi @abbasrizi.bsky.social · 07/08/2026
I was wondering if you have a bird-watching plan in Cph 😅
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Abbas K. Rizi @abbasrizi.bsky.social · 06/08/2026
Thank you, Takayuki 😊
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Abbas K. Rizi @abbasrizi.bsky.social · 04/08/2026
I’m grateful to the Novo Nordisk Foundation for supporting this project. The fellowship gives me the opportunity to continue exploring how ideas from mathematical infectious-disease modeling can be connected more closely to the practical needs of public health.
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Abbas K. Rizi @abbasrizi.bsky.social · 29/06/2026
Writing a paper [without chatbots] be like spending 8 hours reading 6 papers to write one sentence citing 2 references, and then deleting it the next morning! Or to quote Miranda; "And you write until the rust comes out of the faucet, and it's clear water, and then you write down the clear water."
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Abbas K. Rizi @abbasrizi.bsky.social · 25/06/2026
Interview of Leonard Susskind By David Zierler on May 1 and 3, 2020 Niels Bohr Library & Archives American Institute of Physics repository.aip.org/node/129600
repository.aip.org
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Abbas K. Rizi @abbasrizi.bsky.social · 25/06/2026
This reminded me of Susskind’s 2020 interview, back when things felt less broken. He was already worried that popular science was becoming performance: Scientific American, once “the real stuff” from working scientists, now increasingly unscientific, and dangerous because people still trust it!
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Eiko Fried @eikofried.bsky.social · 15/06/2026
In addition to a hiring PhD in ~October & hopefully some PhDs and postdocs ~February, if anyone would like to work with me as part of eg a Marie-Curie or something similar, please do get in touch. Topics include depression, classification, measurement, systems, time-series, & theory building.
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Abbas K. Rizi @abbasrizi.bsky.social · 07/06/2026
I miss the days when conference social media was about sharing ideas rather than documenting attendance. 3/3
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Abbas K. Rizi @abbasrizi.bsky.social · 07/06/2026
Today, LinkedIn seems to have replaced X more than Bluesky has, and after seeing countless #NetSci2026 posts, I'm struck by how little scientific content they contain. Most are little more than corporate-style selfies and networking announcements. 2/3
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Abbas K. Rizi @abbasrizi.bsky.social · 07/06/2026
Back in the good old Twitter days, people would attend conferences and share actual scientific highlights from talks and posters. Even if you couldn't be there, you could still follow along through thoughtful threads from colleagues reflecting on the science. 1/3
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ArXiv Paper Poster (cs.SI & ph-soc) @soc-net-bot.bsky.social · 01/06/2026
The Effect of Mobility Trajectory Sparsity on Epidemic Modeling Outcomes arxiv.org/abs/2605.31282 GPS mobility data are increasingly used in epidemic modeling, allowing the construction of co-location networks or population flows. These trajectories typically exhibit high temporal spa...📈🤖
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Abbas K. Rizi @abbasrizi.bsky.social · 28/05/2026
From today, science is dead. Or maybe not! Some reflections on how AI is changing the very practice of research or any other creative endeavour: abbas.sitpor.org/2026/05/28/f...
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YY Ahn @yyahn.bsky.social · 10/04/2026
www.nytimes.com/interactive/...
nytimes.com
How the U.S.-Israeli Strikes on Iran Have Damaged Schools and Hospitals
The Times has verified U.S.-Israeli strikes on at least 39 schools and hospitals, a fraction of the devastation so far.
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Takayuki Hiraoka @takayukihir.bsky.social · 08/04/2026
New preprint on arXiv: “Message passing and cyclicity transition” arxiv.org/abs/2604.01201 I argue that message passing for percolation isn’t looking for the giant component; it’s just counting cycles. Comments and feedback welcome!
arxiv.org
Message passing and cyclicity transition
Message passing, also known as belief propagation, is a versatile framework for analyzing models defined on graphs. Its most prototypical application is percolation; yet, the interpretation of the mes...
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Athena Akrami @athenaakrami.bsky.social · 02/04/2026
Pasteur Institute of Iran, founded in 1920 now destroyed by Israel-US bombing😞 It played a pivotal role in developing vaccines & public health services, for over a century, now gone😞 A few days ago a pharmaceutical plant was bombed, accused of making anesthetic fentanyl #War #PasteurInstituteIran
Rubble and ruins -- Iran Pasteur Institute in Tehran, bombed by US-IsrealRubble and ruins -- Iran Pasteur Institute in Tehran, bombed by US-IsrealRubble and ruins -- Iran Pasteur Institute in Tehran, bombed by US-IsrealRubble and ruins -- Iran Pasteur Institute in Tehran, bombed by US-Isreal
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
The deeper question, though, is neither about birds nor frogs. How AI enters that community, how credit is shared, how new ideas are appreciated, how judgment is calibrated, matters more than anything it can compute.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
And when a generation of researchers outsources the frog-work from the very beginning, what do they lose? Science is a community product, built from argument, partial progress, and the slow accumulation of trust between people who have learned to communicate properly and read each other’s mistakes.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
Anyone who has spent real time doing that work knows this is not a small thing. AI’s power is no surprise to me. But I still have two questions to ponder. Can AI do what bird-type scientists do, sense a connection between two distant fields that nobody was looking for? The early evidence is thin.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
This is where AI has quietly entered. What it changes most concretely is the cost of exploring nearby territory: small gaps in the literature, routine reformulations, the patient, frog-work of science, done now at a speed that was not possible before.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
The edge of knowing is like the inside of a sponge, full of cavities and half-finished arguments [the right picture]. Good research is not always about filling those holes. Sometimes it is about finding the one whose filling leads to new horizons, and sometimes we can wisely avoid others.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
Science needs both, and Dyson’s point was not that one is better than the other. Most of us begin our careers in science as frogs. We specialize, reach the frontier of what is known, and push it forward a little [Matt Might’s illustration on the left]. That frontier is not a clean edge, tho.
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Abbas K. Rizi @abbasrizi.bsky.social · 25/03/2026
Freeman Dyson once said scientists fall into two types: birds and frogs. Birds fly high above the landscape, drawn to the horizon, looking for connections that tie distant ideas together. Frogs live close to the ground, digging into one problem at a time. Hilbert was a bird. Besicovitch was a frog.
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Athena Akrami @athenaakrami.bsky.social · 15/03/2026
A heartbreaking message from a brilliant med student in Iran, determined to pursue neuroscience. She graduated only one week before the war started and now is volunteering to care for the injured. What would you tell her? (Part #4, especially). Please share your thoughts and comments. #IranWar
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Abbas K. Rizi @abbasrizi.bsky.social · 09/03/2026
This is me in 2017 after the first workshop on complex systems for high school students at Allameh Helli High School in Tehran. Teenage boys and girls were sitting next to each other, curious and full of questions. I loved that school. Seeing it damaged by US and Israeli bombs is heartbreaking.
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Abbas K. Rizi @abbasrizi.bsky.social · 27/02/2026
Congrats @nbes.bsky.social 🎉
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Abbas K. Rizi @abbasrizi.bsky.social · 13/02/2026
What is emergence, after all? New PNAS Nexus paper: academic.oup.com/pnasnexus/ar.... In this paper, I clarify the scientific meaning of emergence as a measurable and physically grounded phenomenon through concrete examples, such as temperature, magnetism, and herd immunity in social networks.
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Abbas K. Rizi @abbasrizi.bsky.social · 27/01/2026
If you have an Iranian colleague or friend, this is likely how they feel theses days:
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Athena Akrami @athenaakrami.bsky.social · 14/01/2026
We're already in the phase that each of us (Iranians) by now know someone killed/injured in our circle of friends/family. And this is despite the continued internet blackout, when millions haven't still managed to hear from their family/friends since Thursday, January 8th. This tells a lot ... 😥😥
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Abbas K. Rizi @abbasrizi.bsky.social · 28/12/2025
How did we decide to call a tree “tree”? A bird “bird”? Not now, but in the early days, when there could have been different ways to name or define something. On Language & Poetry | A short post I wrote over the Christmas holidays; abbas.sitpor.org/2025/12/28/o...
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Abbas K. Rizi @abbasrizi.bsky.social · 23/12/2025
Pokec (Slovak Facebook) is a clearer example of how aggregate homophily can be misleading, as mixing patterns change systematically with group size. with @bolozna.bsky.social @clarastegehuis.bsky.social and Riccardo Michielan
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Abbas K. Rizi @abbasrizi.bsky.social · 23/12/2025
What if birds of a feather flock together, but only at specific group sizes? www.nature.com/articles/s41... This is the focus of our new paper, now published in Nature Communications. We introduce a new network model and show how to model and measure homophily to incorporate group variations.
nature.com
Homophily within and across groups - Nature Communications
People tend to connect with similar others in different groups, shaping how ideas and diseases spread. The authors introduce a data-validated model that captures homophily across group sizes and show ...
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Abbas K. Rizi @abbasrizi.bsky.social · 17/12/2025
But we keep calling the same things by different names in practice, sometimes it’s jargon, sometimes it’s marketing, but what do you think is the worst way this ends up misleading people? PS: We even renamed “graphs” to “networks” for marketing, and that was fine… right?
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Abbas K. Rizi @abbasrizi.bsky.social · 30/11/2025
“I have always tried to live in an ivory tower; but a tide of shit is beating at its walls, threatening to undermine it.” Doing science in contemporary academia, with its endless pressure to please grant committees, often feels like this Flaubert’s complaint in an 1872 letter to Turgenev.
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Abbas K. Rizi @abbasrizi.bsky.social · 14/11/2025
What you expect the least from the reviewers and the editor is exactly checking for the main claims!
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Abbas K. Rizi @abbasrizi.bsky.social · 13/11/2025
Being in #academia as someone not from the global north be like: #phdchat #phdlife
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Abbas K. Rizi @abbasrizi.bsky.social · 10/11/2025
Hmm, this isn’t a cumulative curve, so the interpretation should consider the entire trajectory, not only the late stages of the pandemic. I also wonder whether trust in Sweden stayed constant throughout.
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Abbas K. Rizi @abbasrizi.bsky.social · 02/11/2025
“Physicists are very good and famous for getting the right answers for the wrong reasons.” Why? Here’s a clue: noisy philosophizing! Sean commenting on Nima's talk, Two Cheers for Shut Up and Calculate, at the Natural Philosophy Symposium 2025
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Abbas K. Rizi @abbasrizi.bsky.social · 20/09/2025
@pholme.bsky.social's feed
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Juhi Kulshrestha @juhi153.bsky.social · 17/09/2025
We are hiring multiple PhD and postdocs for two newly funded projects at the intersection of mental health and political polarization at the CS Dept at Aalto, Finland. The PIs are Juhi Kulshrestha, Talayeh Aledavood, and Mikko Kivelä. Full call text and link to apply: www.aalto.fi/en/open-posi...
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Abbas K. Rizi @abbasrizi.bsky.social · 05/09/2025
We should switch from paper to screen posters—more eco-friendly and far more engaging. Elisa’s poster already showed us how creative this can be. @elisamurators.bsky.social @cssociety.bsky.social
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Abbas K. Rizi @abbasrizi.bsky.social · 05/09/2025
Thank you for this opportunity. The slides of my talk & the preprint are available at abbas.sitpor.org
arxiv.org
Homophily Within and Across Groups
Homophily-the tendency to connect with similar others-plays a central role in shaping network structure and function. It is often treated as a uniform, global parameter, independent from other structu...
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Abbas K. Rizi @abbasrizi.bsky.social · 01/09/2025
Excited to present 2 of our recent works at @css-conference.bsky.social “Social & Special Landscape of Covid-19 Immunity in Denmark” - Tue at 15:30, Room 13 - Thu at 12:30, Old Chapel Room “Homophily Within and Across Groups” - Thu at 10:30, Room 13, CSS Satellite
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