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Pierre Haas

@lepuslapis.bsky.social
465 followers 323 following 147 posts

Research group leader at @mpipks.bsky.social and @mpi-cbg.de. Mechanics, mathematics, and more.

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Reposted by Pierre Haas
Alain Goriely @alaingoriely.bsky.social · 07/10/2026
OpenAI quietly releases the full proofs of 377 open conjectures in various fields of mathematics, deepening maths existential crisis. github.com/openai/math
github.com
GitHub - openai/math
Contribute to openai/math development by creating an account on GitHub.
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 06/10/2026
Portrait of Agnes Toth-Petroczy @tothpetroczylab.bsky.social by @helmholtz.de. Agnes researches @casusscience.bsky.social and is a jointly appointed professor @tudresden.bsky.social @cmcb-tud.bsky.social & @hzdr.bsky.social and also research group leader @mpi-cbg.de. www.helmholtz.de/en/newsroom/...
helmholtz.de
The Disorder of Life
Chemist Ágnes Tóth-Petróczy studies disordered proteins. It’s clear that these proteins play a role in the development of diseases – and she and
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Nature @nature.com · 06/10/2026
BREAKING: The Nobel Prize in Physics has been awarded to Francis Halzen “for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.” More to follow.
A photo of the Nobel medal
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Ricard Alert Zenón @ricardalert.bsky.social · 05/10/2026
New preprint! Migrating cell clusters have an asymmetric shape, with higher contact angle at the rear and lower at the front. We explained it by treating the tissue as an active droplet driven by asymmetric tractions! arxiv.org/abs/2610.03536
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Physical Review Letters @physrevlett.aps.org · 05/10/2026
Scientists studied a porcine mitral valve and a conical shell model and found that flow fluctuations triggered buckling and sealing. High-speed imaging and a stochastic model captured the transition. Read the Letter: go.aps.org/4dnvyeO
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Max-Planck-Gesellschaft @maxplanck.de · 09/09/2026
We are hiring! Start at a #MaxPlanckInstitute with your own independent Max Planck Research Group. This position is equivalent to a W2 Professorship at a German university, or Associate Professor internationally. 🔗Apply until October 14th! www.mpg.de/career/max-p... #ScienceCareer #MPRG #TenureTrack
Call for independent Max Planck Research Groups
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RTG 3142 Biological Making of Materials @rtg3142-bmm.bsky.social · 04/10/2026
We’re excited to launch the Bluesky account for DFG-funded Research Training Group 3142: Biological Making of Materials Follow us to learn more about our research, people and activities. Learn more: www.digs-ils.phd/rtg-bmm #RTG3142 #Biomaterials #Science #Research #DFG
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
Our work thus illustrates how details of cell mechanics can matter even at the emergent tissue scale. This was actually motivated by a question from an anonymous reviewer of our recent work on "unbuckling" @apsjournals.aps.org @physrevlett.aps.org. (Thanks!) doi.org/10.1103/PhysRevLett.134.118402
doi.org
Unbuckling Mechanics of Epithelial Monolayers under Compression
At sufficiently large compression, buckling amplitude in cell sheets decreases with increasing compression.
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
By taking the continuum limit (and performing an asymptotic expansion to sixth order), we compute an effective Landau theory for the buckling problem, explaining the continuous-discontinuous buckling transition quantitatively in terms of a line of tricritical points.
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
We make an analogy to Landau theories of phase transitions to explain this behaviour (surprisingly, buckling has rarely been discussed in this way).
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
Motivated by tissue folding instabilities (what else?), we study the buckling of a cell monolayer under compression in this model. Unusually, we find that buckling becomes discontinuous at intermediate B. Thus cytoplasmic mechanics can change tissue-scale behaviour even qualitatively!
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
To answer this question, we introduce a minimal vertex model that adds a cytoplasmic contribution, with a modulus B, motivated by the confinement energy of cytoplasmic polymers (previously discussed by Hannezo et alii, doi.org/10.1073/pnas.1312076111).
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
The cell cortex and cell adhesion contribute to epithelial cell and hence tissue mechanics and are often modelled in vertex models. But what about the mechanical contribution of other, cytoplasmic contributions to these mechanics?
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Pierre Haas @lepuslapis.bsky.social · 05/10/2026
New #preprint: "Discontinuous buckling from cytoplasmic mechanics in vertex models of epithelia" arxiv.org/abs/2610.03239 More buckling from the #PhD work of @chandraniva.bsky.social.
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Physics World @physicsworld.bsky.social · 02/10/2026
How confident, or perhaps delusional, do you have to be to travel to Stockholm because you’re so certain you’ll be awarded a Nobel prize? One person who did just that was the Indian physicist C V Raman in 1930. Preetish Kakoty recounts how he did end up winning. 🧪⚛️ physicsworld.com/a/c-v-raman-...
physicsworld.com
C V Raman: the physicist with a 'Himalayan ego' who went to Stockholm convinced he’d win a Nobel prize – Physics World
Preetish Kakoty describes why India's only Nobel-prize-winning physicist went to Sweden on a whim
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Jorge Ferreira @jorgeferreira.bsky.social · 25/09/2026
Don´t know yet what you´ll be doing next April? Why not join us for a great meeting in Porto? Registration for Forces across scales is now open! meetings.embo.org/event/27-for...
meetings.embo.org
Forces across scales
This EMBO Workshop on Forces Across Scales will provide an integrative perspective on mechanobiology, a rapidly advancing field that examines how mechanical forces shape biological systems across mol…
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MwahahahahahadScientist @mads100tist.bsky.social · 25/09/2026
As Gregor Samsa awoke one morning from uneasy dreams he found himself transformed in his bed into a senior postdoc
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Timothy Gowers @wtgowers.bsky.social · 17/09/2026
I've written a blog post responding to the letter about maths and AI signed by 25 Fields medallists. As with the Leiden Declaration, I didn't sign it, but I agree with much of it and welcome its existence. gowers.wordpress.com/2026/09/17/w...
gowers.wordpress.com
Why I didn’t sign the Fields medallists’ letter
When I was around 11 I heard for the first time about Fermat’s Last Theorem. I was immediately captivated by the problem statement, as well as by the accompanying story, and made a fairly ser…
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Physical Review Letters @physrevlett.aps.org · 17/09/2026
A new wave turbulence regime in active matter has been found using numerical simulations. When in dense suspensions, active phoretic disks with physico-chemical hydrodynamic interactions remain caged and perform local vibrations. Read the Letter: go.aps.org/4gWWg08
Animated gif showing a zoomed-in view of turbulence with negligible net displacement of disks, at Pe = 4.5 and φ = 0.5, with time τ running from 0 to 200. Multiple disks are depicted in a box and colored by the velocity component U x 15 (ranging from dark blue at -5, through red at 0, to green at 5). Arrows indicate their swimming directions, which are constantly changing. Black lines trace the trajectories of five selected disks, creating five localized roughly circular scribbles, indicating that the disks are vibrating locally, and remain within a caged region, rather than performing large-scale advection.
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 04/09/2026
We are hosting the Dive into Research (DiR) workshop for 16 students (Aug 10 - Sep 18), as part of the Combinatorial Synergies initiative. Organizers: Irem Portakal & Benjamin Hollering from MPI for Mathematics in the Sciences & @aidadoesmath.bsky.social @mpi-cbg.de @csbdresden.bsky.social #DiR2026
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Alex Ludwig @alexludwig.bsky.social · 14/09/2026
How do epithelial cells make a lumen as they polarize? We have some exciting new answers to this long standing question. Check out our new paper in which we show that lumen initiation is driven by large vacuoles that deliver a pre-assembled apical cortex to the AMIS: www.nature.com/articles/s41...
nature.com
Bulk delivery of a preassembled apical surface initiates epithelial lumen formation - Nature Communications
Epithelial lumen formation is fundamental to organ development, yet how apical surfaces first emerge remains unclear. Ghosh, Martin, and Chen et al., show that lumen initiation is driven via bulk deli...
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Pierre Haas @lepuslapis.bsky.social · 07/09/2026
On our way to the faculty retreat @mpi-cbg.de. A tad chilly...
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Max-Planck-Gesellschaft @maxplanck.de · 01/09/2026
Apply to our #postdoc program! 🤓🧑‍🔬 Applications are now open until October 13th, 2026 - don’t miss your chance to take your research to the next level with expert mentorship, workshops, coaching and more. www.mpg.de/en/max-planc...
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Rita Mateus @ritamateus.bsky.social · 01/09/2026
Join us for an evening at the intersection of Art and Science <3 this will be fun!!!
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Max Planck School Matter to Life @mattertolife.bsky.social · 01/09/2026
Apply now for the Matter to Life Integrated Graduate Program 2027! 🎓 mattertolife.maxplanckschools.org/application Join a fully funded program, connect with scientists across Germany and become part of an interdisciplinary community working toward the question: What is life?🧬 Deadline: Dec 1, 2026
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Alexandra Weber @toedtoad.bsky.social · 31/08/2026
My first paper is officially out in @currentbiology.bsky.social ! We found that snake embryos coil due to a mismatch in growth rates between the gut and spine. This tight coil is one of the reasons why snakes are able to get so long. Read the paper here!
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APS journals @apsjournals.aps.org · 26/08/2026
A new theory combining growth kinetics, diffusion, and percolation suggests that negative feedback through monomer depletion explains the coexistence of branched actin networks. Learn more in PRX Life: go.aps.org/4gzr59K
An illustration of actin networks grown from beads with either high, shown in blue, or low, shown in orange, coating densities of nucleation promoting factor that coexist in a shared pool of actin monomers. The image shows how the strong beads create denser networks than the weak beads and consume more monomers per time.
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Raphaël Clément @raphclement.bsky.social · 27/08/2026
A developmental biologist's guide to mechanics, just out in Development! In which we learn about the three pillars of any mechanical model: forces, mechanical properties, and boundary conditions. @pflenne.bsky.social @alessandrochppr.bsky.social @caojialing1002.bsky.social @dev-journal.bsky.social
journals.biologists.com
A developmental biologist's guide to mechanics
Summary: A guide to mechanics in development: unlock how forces, material properties and geometry shape the forms of life.
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Pierre Haas @lepuslapis.bsky.social · 26/08/2026
It was great to celebrate the quartercentenary (if that's a word...) @mpi-cbg.de!
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 24/08/2026
We are celebrating 25 years since opening our building in Dresden on January 22, 2001! #25yearsmpicbg www.mpi-cbg.de/news-outreac...
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Wolfram Pönisch @wolframponisch.bsky.social · 18/08/2026
Postdoc in my group at @humantechnopole.bsky.social! We want to answer how single-cell morphodynamics is connected to cell topology & state in cell collectives, using data analysis and theoretical modelling. Please share! careers.humantechnopole.it/job/Postdoc-...
careers.humantechnopole.it
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paveltomancak.bsky.social @paveltomancak.bsky.social · 03/08/2026
#Twisting embryos and multiple #attachment sites in #Drosophila - now both available as #preprints. Proud of @giuliaserafini.bsky.social & @cuencam15.bsky.social, who worked together & established theory collaborations with @lepuslapis.bsky.social & @carldmodes.bsky.social @mpi-cbg.de at its best
Giulia SerafiniMarina Cuenca
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DGZ.bsky.social @dgz.bsky.social · 15/07/2026
Join us on July 21 at noon for the next #DGZ #FocusWorkshop on #PhysicsOfTheCell, organized by @lmoeckl.bsky.social and @lepuslapis.bsky.social. Topics include mechanics of reproduction, glycan atlassing, embodied computation in ciliates, and physics of cell division @alisonkickuth.bsky.social
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Toth-Petroczy lab @tothpetroczylab.bsky.social · 02/07/2026
I am honored and excited about the opportunity to lead the Department of Systems Biology at the Center for Advanced Systems Understanding (CASUS) at HZDR @casusscience.bsky.social in Görlitz and join as a Professor at BIOTEC/CMCB @biotec-tud.bsky.social. www.casus.science/news-profess...
casus.science
News — Professorship and tenured position: Saxony retains top computational biologist – CASUS – Center for Advanced Systems Understanding
Ágnes Tóth-Petróczy to become third full professor working at CASUS and BIOTEC
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Physics of Life Dresden @poldresden.bsky.social · 24/06/2026
🏆 Introducing the inaugural Suzanne Eaton Awards for Physics of Life! We're thrilled to announce the 2026 recipients: L. Mahadevan @harvard.edu and Anna Erzberger @embl.org. 👨‍🔬Both scientists will give award lectures on 20. November, more info to follow ➡️Read our announcement here: tud.link/cjm8t2
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Human Technopole @humantechnopole.bsky.social · 24/06/2026
✨ Meet @dolliemae.bsky.social, our new Group Leader in the Molecular Cell Biology Research Centre. 🧬 Her Group will explore how protein mutations reshape cell behaviour and contribute to human disease, focusing on the nuclear envelope. Read more 👉 humantechnopole.it/en/news/intr...
humantechnopole.it
Introducing Dollie LaJoie - Human Technopole
Dollie LaJoie is a new Research Group Leader at Human Technopole, in the Molecular Cell Biology Research Centre. Her research explores how mutations in proteins can alter cell behaviour and contribute...
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 23/06/2026
ERC Advanced Grant @erc.europa.eu for @mpi-cbg.de director Stephan Grill @grill-lab.bsky.social! 🎉 He receives 2.5 million euros for his project “DNA Sequence-Dependent Structure Formation in the Cell Nucleus.” Congratulations! 🥳 🥳 🥳 www.mpi-cbg.de/news-outreac...
mpi-cbg.de
ERC Advanced Grant for Stephan Grill
European Research Council funds research project on physical foundation for sequence-guided genome organization with 2.5 million euros
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 18/06/2026
Otto Hahn Medal for three @mpi-cbg.de researchers: Kristin Böhlig in the group of André Nadler, Alison Kickuth in the group of Jan Brugués @poldresden.bsky.social, Giulio Zucal, from MPI-MiS in Leipzig and now mentored by Türkü Özlüm Çelik and @grill-lab.bsky.social. www.mpi-cbg.de/news-outreac...
Kristin Boehlig (middle) at the award ceremonyAlison Kickuth (middle) at the award ceremonyGiulio Zucal speaking at a podium
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Ricard Alert Zenón @ricardalert.bsky.social · 12/06/2026
Our paper on a Hamiltonian description of non-reciprocal interactions is out @natphys.nature.com! With Yubo Shi, Roderich Moessner, and @marinbukov.bsky.social @mpipks.bsky.social @ub.edu @icreacommunity.bsky.social Check it out, and read more in the thread below! 👇 www.nature.com/articles/s41...
nature.com
Hamiltonian description of non-reciprocal interactions - Nature Physics
Many active and driven systems exhibit non-reciprocal interactions, making them hard to describe with standard methods. Now a constrained Hamiltonian embedding with auxiliary variables reproduces thes...
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American Physical Society @apsphysics.aps.org · 12/06/2026
How does a ‘genius without a brain’ make decisions? By trapping #SlimeMold inside polygons made of harmful blue light, a PRX Life study found that these organisms explore nearly the entire boundary before settling on the best escape route. Read the study: go.aps.org/4uXE9LZ
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Dollie LaJoie @dolliemae.bsky.social · 10/06/2026
Seeking a post-doc for the LaJoie lab at the Human Technopole, Milan, Italy! We are looking for candidates from the fields of biochemistry, cell biology, and proteomics, who are interested in studying protein interactions of the nucleus 🤓 lnkd.in/dTG2CgXF
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Max Planck Institute of Molecular Cell Biology and Genetics @mpi-cbg.de · 10/06/2026
Pond vibes at the institute.
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Physics of Life Dresden @poldresden.bsky.social · 10/06/2026
🤔🧫How do cells within a tissue move/differentiate with such remarkable precision, in the right place and right time? 👨‍🔬The Barriga group @eliasbarrigalab.bsky.social explores the biophysical mechanisms that coordinate morphogenesis in development + regeneration YouTube video👉 youtu.be/vJtpAVkHZzU
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Pierre Haas @lepuslapis.bsky.social · 10/06/2026
Where else but #CISM can one lecture in a hall covered in frescoes?
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Society for Developmental Biology @socdevbio.bsky.social · 08/06/2026
✨Rare model organisms can teach us how to build a body differently. In snail embryos blastomeres can be as big as the rest of the embryo! 🐌Phrontis vibex blastula stained for tubulin (gray), phalloidin (blue) and histone (magenta). 🔬 #ModelMonday #DevBio 📸: Clemens Cabernard
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EMBO @embo.org · 09/06/2026
Congratulations to Gautam Dey (EMBL) and Omaya Dudin (University of Geneva) for being awarded the EMBO Gold Medal 2026 in recognition of their outstanding contributions to the #LifeSciences in Europe! 🧪 www.embo.org/press-releases/embo-go…
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Dagmar Iber & CoBi @iberd.bsky.social · 08/06/2026
🧰 New tool alert! ⚙️ #MorphoGrad, an open-source toolbox for simulating reaction–diffusion systems in 1D and 2D tissues, with cell-to-cell parameter heterogeneity & graphical user interface. No heavy coding required. Explore complex morphogen gradient models interactively. doi.org/10.1016/j.xp...
cell.com
MorphoGrad: A MATLAB toolbox for simulating steady-state morphogen gradients under cell-to-cell variability
Studying morphogen gradient-based tissue patterning in silico while accounting for biological variability remains challenging. Here, we present a MATLAB-based protocol for simulating steady-state morp...
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Pierre Haas @lepuslapis.bsky.social · 07/06/2026
Just got to Udine, to lecture in the #CISM Advanced School on "Geometry, Growth, and Instability in Soft and Active Systems". This will be a fun week.
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EMBL @embl.org · 02/06/2026
How do the physical properties of embryos affect their development? New research from EMBL scientists and collaborators shows that tissue mechanics actively influence developmental signalling – revealing new links between physics and embryogenesis. www.embl.org/news/science...
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