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M. Kasiulis

@quasiulysse.bsky.social
311 followers 1.1K following 50 posts

Senior Research Scientist in numerical stat mech and optics at NYU | Scicomm enthusiast and Lutetium Project co-founder | Previously Postdoc at Technion, PhD student at Sorbonne U, youngling at ENS and ESPCI.

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M. Kasiulis @quasiulysse.bsky.social · 18/09/2026
And actually, for the Korean physicists around here, today and tomorrow I have the pleasure of not just attending, but also of giving a lecture at the monthly meeting of the KPS statistical physics meeting at UNIST -- which has a very misty mountain vibe today 🗻🧙🏻‍♂️
UNIST campus. It is WET today, but tall modern buildings tower in the beautiful Korean mountains
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M. Kasiulis @quasiulysse.bsky.social · 18/09/2026
I have been quieter while settling but it's official, my own research group is now operational at APCTP! The East Asian campus vibe is a nice change of pace from NYC too 🌏🌏
The POSTECH campus near APCTP. A clock tower is seen in the distance and an observatory pops out of one of the roofs
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M. Kasiulis @quasiulysse.bsky.social · 13/08/2026
I have a confession to make: I was reviewer #2 all along 👹 It is both a pleasure and an honor to receive a Reviewer Excellence Award from Physical Review E. We seldom advertise this aspect of our job, in spite of peer review being vital to science. Thanks, PRE editors! www.aps.org/funding-reco...
aps.org
APS Reviewer Excellence Award
This award acknowledges reviewers who have recently made exceptional contributions to peer review for the APS journals.
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M. Kasiulis @quasiulysse.bsky.social · 24/06/2026
Life update! Starting in September 2026, I will be starting my ✨own group✨ at the Asia-Pacific Center for Theoretical Physics (APCTP) in 🇰🇷South Korea🇰🇷! Which means that I am looking for postdocs in the fields of statistical physics and/or complex dynamical systems! www.apctp.org/bbs/board.ph...
apctp.org
apctp
Postdoctoral Position in “Complexity, Dynamics & Disorder Group" Group > 채용공고 | apctp
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M. Kasiulis @quasiulysse.bsky.social · 06/04/2026
Today on arxiv, a blast from the past: Hamiltonian flocks! Some years ago we showed that this conservative model could support collective motion. In this preprint, I discuss how to properly couple the model to a bath and the effects of time-reversal symmetry in it! arxiv.org/abs/2604.02914
arxiv.org
Hamiltonian flocks: Time-Reversal Symmetry and its consequences
The fluctuation-dissipation theorem is a hallmark of equilibrium system that stem from their time-reversal symmetry. In many non-equilibrium systems, in particular active ones, extensions and explicit...
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M. Kasiulis @quasiulysse.bsky.social · 14/11/2025
It is an honor and a pleasure to be spontaneously featured in Optica's official outreach platform! Many inspiring papers published in Optica's journals were read in the making of this work, so it feels like a nice loop 😄 www.optica-opn.org/home/newsroo...
optica-opn.org
Gyromorphs Should Block Light in All Directions
Simulated materials yield isotropic band gaps, suggesting use in optical computer chips.
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M. Kasiulis @quasiulysse.bsky.social · 13/11/2025
New preprint! So, say you're studying some critical transition. How do you catch its universality? Pair correlations? Boring! We threw line segments at the system, looked at intersections with clusters, and uncovered static and dynamical universal behavior of MIPS! arxiv.org/abs/2511.09444
media.tenor.com
a close up of a person 's hand holding a marker that says sharpie
Alt: a close up of a person's hand holding a marker that says sharpie
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M. Kasiulis @quasiulysse.bsky.social · 07/11/2025
New paper just out, as an editor's suggestion in PRL! While looking for the ideal isotropic bandgap material, we actually discovered new structures. These structures lie at the border between order and disorder, and that's good for optics! More about their structure here, tinyurl.com/3aej53ht ⚛️🧪
Illustration of a 60-fold gyromorph's properties.
Top row: Structure of the gyromorph. Left: Structure factor. Right: Pair correlation function.
Bottom row: Evidence of a bandgap. Left: Scalar optical field inside the gyromorph. Right: Density of states depletion in the gyromorph.
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M. Kasiulis @quasiulysse.bsky.social · 08/09/2025
Well, not everyone can get a vote of confidence -- but this paper did! New PNAS, 🔥🔥🔥 hot from the press 🔥🔥🔥 And it is an opportunity to thank my collaborators on this project, special shout-out to Eden+Matan for the experiments on robots that motivated this! www.pnas.org/doi/10.1073/...
pnas.org
A geometric condition for robot-swarm cohesion and cluster–flock transition | PNAS
We present a geometric design rule for size-controlled clustering of self-propelled particles. We show that active particles that tend to rotate un...
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Reposted by M. Kasiulis
Anthony Moser @anthonymoser.com · 26/04/2025
A key difference here is that while either can be incorrect, the structure of Wikipedia *creates context* and the structure of LLMs *destroys context* Wikipedia has linked sources and an edit history showing where information came from and who added it when An LLM just generates text
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Dr. Jonathan Foley @globalecoguy.bsky.social · 10/02/2025
We need to see science as a social compact where it serves the larger world, not our own interests. As a first step, scientists must communicate to the larger world much better. I wrote an essay about this in 2016, which still holds today. globalecoguy.org/science-comm...
globalecoguy.org
Science Communication as a Moral Imperative
We need to do a much better job of encouraging scientists to be stronger communicators, and share the wonders of science, and the important…
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M. Kasiulis @quasiulysse.bsky.social · 20/11/2024
Ok, last update: how to make isotropic bandgaps? At low index contrast, the answer is aperiodic structures, e.g. quasicrystals. We propose that the best material would have a structure factor as close as possible to being just one ring of high values: enter gyromorphs. arxiv.org/abs/2410.09023
2d pair correlation function intensity map of a 60-fold gyromorph2d structure factor intensity map of a 60-fold gyromorphCircular chunk of a 60-fold gyromorph
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M. Kasiulis @quasiulysse.bsky.social · 19/11/2024
Next up: for a change of scenery, let's look at energy landscapes! We showed that numerical commonly used to study the location, energy, and entropic bias of minima in jammed soft spheres completely destroy the geometry of the landscape, and provide an alternative. arxiv.org/abs/2409.121...
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M. Kasiulis @quasiulysse.bsky.social · 18/11/2024
Ok let's keep going with updates! This time no point patterns, only robots 🤖 We show that it really matters how their mass is distributed to know how they behave as a collective... Depending on whether they have a heavy head or a heavy back, robots flock or cluster! arxiv.org/html/2409.04...
arxiv.org
A geometric condition for robot-swarm cohesion and cluster-flock transition
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M. Kasiulis @quasiulysse.bsky.social · 12/11/2024
Oh and actually, I almost forgot, I will be in Paris this December to talk about spectrally-shaped point patterns, FReSCo, and hyperuniformity at the Hyperuniformity workshop organized by Inria! hyperuniformity.sciencesconf.org
media.tenor.com
a nun in front of a chalkboard with the words we are going to france
Alt: A nun in front of a chalkboard with the words we are going to France. Like me. In December. I'm going to France. The land of baguettes, PNL, and Inria workshops. So uh, if you are in Paris and want to say hello and/or talk about my work please reach out!
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M. Kasiulis @quasiulysse.bsky.social · 12/11/2024
Ok so it's been an eventful couple of months or so for me! Let's recap a bit. First, our work on spectral optimization of point patterns is actually out as an Editor's Suggestion in PRE! If you care about correlated disorder, this is probably a good read! journals.aps.org/pre/abstract...
journals.aps.org
Fast generation of spectrally shaped disorder
Systems with correlated disorder can display unusual optical properties, but it is a challenge to design such structures with desired long-range correlations. The authors introduce an efficient algori...
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M. Kasiulis @quasiulysse.bsky.social · 07/11/2024
Hey everyone! I decided I would come back on social media a bit more in the near future, partly because I am now on the ✨Job Market✨ Since I had left the bad place for good already I took the time to re-follow a lot of you. I hope we can rebuild a vibrant interdisciplinary academic community here!
media.tenor.com
a cartoon of a robot with the words time to research above it
Alt: a cartoon of a robot with the words time to research above it
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M. Kasiulis @quasiulysse.bsky.social · 19/12/2023
Hey, ever wanted to make point patterns or particle packings but with that one specific kind of correlation you care about? Worry not, FReSCo is now officially out there on GitHub! github.com/martiniani-l...
github.com
GitHub - martiniani-lab/FReSCo: Fast Reciprocal Space Correlator
Fast Reciprocal Space Correlator. Contribute to martiniani-lab/FReSCo development by creating an account on GitHub.
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M. Kasiulis @quasiulysse.bsky.social · 15/12/2023
Is that... a paper update? 👀 After months of extra work, our FReSCo framework to embed arbitrary spectral properties into point patterns has greatly expanded! Threads aren't a thing here so I'll be short: dynamics of points go CHOO CHOO in Fourier space! 🚂 shorturl.at/fjkn6 arxiv.org/abs/2305.15693
shorturl.at
The Arrival of a Train in Fourier Space
Frames from the Lumière movie L’Arrivée d’un Train en Gare de La Ciotat (1896), imposed into the structure factor of a pattern of N=300,000 points using FReS...
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M. Kasiulis @quasiulysse.bsky.social · 04/12/2023
Very nice illustration and proof that high-dimensional basins of attraction are shaped like urchins today on the cover of PRL! journals.aps.org/prl/abstract... Nice throwback to our perspective on how to compute their volumes too! More on that soon™️ 👀 www.papersinphysics.org/papersinphys...
journals.aps.org
Star-Shaped Space of Solutions of the Spherical Negative Perceptron
The solutions of a nonconvex over-parametrized neural network model are geodesically connected in a star-shaped geometry.
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M. Kasiulis @quasiulysse.bsky.social · 01/10/2023
A last look at the Alps after a fantastic two weeks at Les Houches -- with a nice Kelvin-Helmholtz instability waving goodbye 🌊 Kudos to the organizers, it's been a fantastic two weeks!
Mountains can be seen in the distance behind Alpine buildings. Clouds break up into waves as they get past the highest peak.
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M. Kasiulis @quasiulysse.bsky.social · 19/09/2023
After a few years away from both Europe and optics, what better way to reconnect than going to Les Houches? 😄🏔️ And yes, spoiler alert, photonics is coming back to my research very soon 👀
Sunny mountain landscape with a few altitude clouds in front of the Les Houches physics school.
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Physics Magazine @physicsmagazine.aps.org · 12/09/2023
If astronomers truly believe “the night sky belongs to everyone,” we should honor that ideal when naming objects in the cosmos. Our job is to tell the Universe's story, and as with all stories, the way we tell it matters, Mia de los Reyes @amherstcollege.bsky.social. physics.aps.org/articles/v16...
physics.aps.org
Astronomers Need to Rename the Magellanic Clouds
A coalition of astronomers calls for renaming the Milky Way’s two brightest satellite galaxies, along with other astronomical objects and facilities that bear the name of a Portuguese explorer who m...
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M. Kasiulis @quasiulysse.bsky.social · 05/09/2023
You may know that 2d solids are almost a field of their own... But it gets even crazier with activity! Find out how activity shatters equilibrium bounds in a great piece of work now out in PRL - or in my first commentary in Physics Magazine 🤗 physics.aps.org/articles/v16...
physics.aps.org
Active Particles Push the Boundaries of Two-Dimensional Solids
Active particles can form two-dimensional solids that are different from those formed by nonmotile particles, showing long-range crystalline order accompanied by giant spontaneous deformations.
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M. Kasiulis @quasiulysse.bsky.social · 05/09/2023
Hello world! You may know me from The Bad Place, I will likely move my main research and Scicomm updates here, I'm excited to see how this platform will evolve 😄
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