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Demian Levis

@demianlevis

Physicist at the University of Barcelona, head of @cuca-lab.bsky.social. Father of 3. Order, disorder, and all that. website: demianlevis.wordpress.com

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11.01.2025
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Latest posts by Demian Levis @demianlevis

CAFE-BIO

EU DN "A Coherent Analysis Framework for Emergence in Biological Systems" (CAFE-BIO) is recruiting 15 PhDs in 12 institutions eg @ubics.bsky.social @ub.edu. #statphys for #bio and #complex problems. Gain international experience with academic and industry secondments.
more info: cafe-bio.org

18.02.2026 11:04 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
Depinning and activated motion of chiral self-propelled particles We study experimentally, numerically, and analytically, the dynamics of a chiral active particle (cm-sized robots), pulled at a constant translational velocity. We show that these robots can faithfull...

Our first experimental paper has just been published πŸ₯³! We show that motorized toys are a great experimental model system to study chiral #activematter. Exact calculations reproducing experimental results with no fitting parameter @ubics.bsky.social journals.aps.org/pre/abstract...

15.12.2025 09:24 πŸ‘ 0 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Avalanches in active glasses with finite persistence We numerically investigate the statistics of avalanches in glassy systems of active particles with finite persistence, with and without an externally applied shear. In departing from the infinite-pers...

arxiv.org/abs/2512.00523

02.12.2025 08:46 πŸ‘ 3 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
COWEN: The stupidest question possible: Why don’t we just make more GPUs?

ALTMAN: Because we need to make more electrons.

COWEN: What’s stopping that? What’s the ultimate binding constraint?

ALTMAN: We’re working on it really hard.

COWEN: If you could have more of one thing to have more compute, what would the one thing be?

ALTMAN: Electrons.

COWEN: The stupidest question possible: Why don’t we just make more GPUs? ALTMAN: Because we need to make more electrons. COWEN: What’s stopping that? What’s the ultimate binding constraint? ALTMAN: We’re working on it really hard. COWEN: If you could have more of one thing to have more compute, what would the one thing be? ALTMAN: Electrons.

I laughed at loud. These people are so pathetic; our enemies are numbskulls. They will kill us all and still not know hs physics.

COWEN: The stupidest question possible: Why don’t we just make more GPUs?

ALTMAN: Because we need to make more electrons.

conversationswithtyler.com/episodes/sam...

19.11.2025 07:27 πŸ‘ 1332 πŸ” 348 πŸ’¬ 112 πŸ“Œ 209
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New prepint w/ @demianlevis.bsky.social
@natxopago.bsky.social L. Isa and E.SesΓ©-Sansa.
We study active binary mixtures to unveil how two populations of active colloids with different motilities interact with each other.

Thanks for the great work!πŸ₯³

arxiv.org/abs/2506.15188

19.06.2025 06:37 πŸ‘ 8 πŸ” 4 πŸ’¬ 1 πŸ“Œ 0
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Com s'organitza el món? - La UB Divulga - UB Taller de la XI Festa de la Ciència de la Universitat de Barcelona.

Hi ha ordre a la natura? πŸƒ Si Γ©s aixΓ­, quin Γ©s aquest ordre i com es manifesta? Ho descobrirem a la #FestaCiΓ¨nciaUB amb l’ajuda de joguines robΓ²tiques πŸ€– web.ub.edu/ca/web/laubd... @cuca-lab.bsky.social @ubics.bsky.social

16.05.2025 09:08 πŸ‘ 5 πŸ” 3 πŸ’¬ 0 πŸ“Œ 0

Check out our new work on #synchronization just published in #PhysRevLett.

07.05.2025 15:15 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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🚨 New paper in PRL: journals.aps.org/prl/abstract...
-> motion induces a topological phase transition in 2D systems of Kuramoto oscillators with random frequencies πŸŒ€ w YRouzaire PRahmani FPeruani IPgagonabarraga @demianlevis.bsky.social @ubics.bsky.social @ub.edu #ComplexSystems #ActiveMatter

07.05.2025 15:13 πŸ‘ 2 πŸ” 2 πŸ’¬ 0 πŸ“Œ 1
Nonreciprocal Interactions Reshape Topological Defect Annihilation We show how nonreciprocal ferromagnetic interactions between neighboring planar spins in two dimensions, affect the behavior of topological defects. Nonreciprocity is introduced by weighting the coupl...

Published in #PhysRevLett! How nonreciprocity affects the behaviour of topological defects? they are reshaped, their annihilation can be enhanced or hindered, +1 -1 charges move differently. PhD work of YRouzaire @ub.edu @ubics.bsky.social with @demianlevis.bsky.social IPagonabarraga and DPearce.

24.04.2025 08:40 πŸ‘ 6 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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What a great week! The 1st Barcelona School on non-equilibrium stat phys has been really successful. Thanks to C Calero, F Ritort, the students and all attendees sponsors and mostly, our 5 Lecturers. #statphys #bcnschoolneqstatphys

15.04.2025 08:47 πŸ‘ 7 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
SIMONS-BALSEIRO POSTDOCTORAL POSITIONS – Condensed Matter Theory Group

🚨Open call: Simons-Balseiro postdoctoral positions in Bariloche, Argentina πŸ‡¦πŸ‡·

➑️ On theoretical physics, broadly defined
➑️ Better salary than most researchers 🀯

Deadline: April 10th 2025

If interested in applying on condensed matter, let us know! πŸ‘‡
www.cond-mat-bariloche.org/2025/03/11/s...

11.03.2025 18:19 πŸ‘ 1 πŸ” 1 πŸ’¬ 0 πŸ“Œ 1
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Trump administration cancels $400M in grants and contracts with Columbia University | CNN The Trump administration said Friday that it’s pulling $400 million from Columbia University, canceling grants and contracts because of what the government describes as the Ivy League school’s failure...

www.cnn.com/2025/03/07/u...

Trump administration cancels $400M in grants and contracts with Columbia University

β€œI love the poorly educated”

07.03.2025 20:20 πŸ‘ 207 πŸ” 92 πŸ’¬ 45 πŸ“Œ 15
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Two artists, one catastrophic war … Joe Sacco and Art Spiegelman on Israel-Gaza and the ceasefire – cartoon What happens when two comics artists β€˜meet on the page’ to explore the tragedies of the Israel-Gaza war? Art Spiegelman, best known for his Pulitzer prize-winning Holocaust memoir Maus, and Joe Sacco, author of bestselling graphic reportage Palestine, grapple with the ongoing crisis

Two artists, one catastrophic war … Joe Sacco and Art Spiegelman on Israel-Gaza and the ceasefire – cartoon

14.02.2025 14:18 πŸ‘ 144 πŸ” 74 πŸ’¬ 4 πŸ“Œ 14
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Crowds start to spin when their densities hit a threshold Video footage of people at a festival reveals collective rotations.

Analysis of a festival uncovers collective rotational movements that emerge at critical densities, which could be universal

https://go.nature.com/415fUif

07.02.2025 16:57 πŸ‘ 50 πŸ” 8 πŸ’¬ 3 πŸ“Œ 2
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The first paper of the Lab is on the cover of Soft Matter! @softmatter-journal.bsky.social
pubs.rsc.org/en/Content/A...
Collective motion of particles with an energy depot JPMIranda @demianlevis.bsky.social and @chantalvaleriani.bsky.social. #activematter #statmech

07.02.2025 13:56 πŸ‘ 3 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0
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Machine learning the dynamics of force-sensing proteins at King’s College London on FindAPhD.com PhD Project - Machine learning the dynamics of force-sensing proteins at King’s College London, listed on FindAPhD.com

I have an exciting opportunity for a PhD on the study of force sensing proteins www.findaphd.com/phds/project... The candidate will have the opportunity to perform experiments in the lab of Rafael Tapia-Rojo and develop theory and machine-learning approaches with me. Start date June 2025

13.01.2025 22:27 πŸ‘ 5 πŸ” 2 πŸ’¬ 0 πŸ“Œ 0