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Uzu Lim

@uzulim.bsky.social
74 followers 74 following 31 posts

🍩 Postdoc at Queen Mary, working on Geometric Data Analysis 🎓 Formerly at Oxford and Postech 🏳️‍⚧️ Non-binary, Any pronouns ✨ Side interest: number theory, physics, art, music sites.google.com/view/uzulim/main

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Uzu Lim @uzulim.bsky.social · 15/04/2026
Gonna try using Bluesky again. Here's a funny picture I found the other day on a paper
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Giovanni di Sarra @giovds.bsky.social · 11/06/2025
🚀 Just released a new tool for the neuroscience and Topological Data Analysis communities! 🔗 github.com/gdisarra/top... The topology-degree repository provides code and methods to quantify the topology in high-dimensional data using persistent homology. 🔗 doi.org/10.1371/jour...
github.com
GitHub - gdisarra/topology-degree: Demo and tutorial for the computation of the topology degree
Demo and tutorial for the computation of the topology degree - gdisarra/topology-degree
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Uzu Lim @uzulim.bsky.social · 30/06/2025
@jeffgian.bsky.social Do you ever need to use spinors when doing Lattice QCD? To consider quarks, and not just gluons?
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Uzu Lim @uzulim.bsky.social · 30/06/2025
Xavier Crean, @jeffgian.bsky.social and Biagio Lucini worked on analysing the topological data arising from lattice gauge theory, like Lattice QCD. See : arxiv.org/abs/2501.19320 I think this is one of the super meaningful applications of TDA, because the data is intrinsically topological (SU(3)).
arxiv.org
Topological Data Analysis of Abelian Magnetic Monopoles in Gauge Theories
Motivated by recent literature on the possible existence of a second higher-temperature phase transition in Quantum Chromodynamics, we revisit the proposal that colour confinement is related to the dy...
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Uzu Lim @uzulim.bsky.social · 30/06/2025
If you apply the path integral approach to a discretised computer simulation of QCD, you get Lattice QCD. When doing Lattice QCD, I think you assign SU(3) elements to each edge of a 4D cubical grid. That now gives you ... some topological data. Tada..!
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Uzu Lim @uzulim.bsky.social · 30/06/2025
The QCD Lagrangian has a Dirac operator which makes quarks and gluons interact. With this Lagrangian, you can either write down scattering amplitudes or Feynman path integrals. My understanding is that the path integral approach still keeps the differential geometry intact.
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Uzu Lim @uzulim.bsky.social · 30/06/2025
I forgot what a spinor is.. a Spin group is a subset of a Clifford algebra. You need this stuff to define fermions, which are electrons and quarks (and other stuff like neutrino). To define quantum chromodynamics (QCD), you get the spin bundle and also a SU(3)-bundle and define a Lagrangian.
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Uzu Lim @uzulim.bsky.social · 30/06/2025
A connection 1-form is also called a gauge field. This formalises, for example, gluon fields. For a full formal account of the standard model, you still need a lot more abstract machinery. Next up is spinors.
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Uzu Lim @uzulim.bsky.social · 30/06/2025
A connection 1-form omega is a g-valued 1-form on P, satisfying some well-behavedness wrt G. Ehremsann connection and connection 1-form are equivalent notions, and the horizontal subspace specified in Ehresmann connection is exactly the kernel of the projection map specified by a connection 1-form.
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Uzu Lim @uzulim.bsky.social · 30/06/2025
An Ehresmann connection H is a sub-bundle of the tangent bundle of a principal G-bundle P->M (double bundle??) The rank of H is equal to the dimension of the base manifold M. H is chosen so that it's "horizontal" and well-behaved wrt G-action.
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Uzu Lim @uzulim.bsky.social · 30/06/2025
Learning gauge theory nowadays, another attempt to learn more mathematical physics
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J. L. Westover @mrlovenstein.bsky.social · 11/05/2025
happy mother's day
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SlenderSherbet @slendersherbet.bsky.social · 03/05/2025
"Excuse me, I'll tell you when you've finished"
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Heather Harrington @haharrington.bsky.social · 05/02/2025
A computation that took us over 8 hours now only takes 15 seconds with tropical geometry! Very excited that Oskar Henriksson will join the algebra in data analysis (AIDA) group @mpicbg.bsky.social @tudresden.bsky.social
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Uzu Lim @uzulim.bsky.social · 02/05/2025
My paper with Luis Scoccola and @haharrington.bsky.social were accepted to present in ICML 2025 🥳🥳 We use gradient descent to solve a fundamental problem in computational topology: Compute a topologically good cover of a dataset. It improves Mapper and persistent homology! arxiv.org/abs/2503.09767
arxiv.org
Cover Learning for Large-Scale Topology Representation
Classical unsupervised learning methods like clustering and linear dimensionality reduction parametrize large-scale geometry when it is discrete or linear, while more modern methods from manifold lear...
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Uzu Lim @uzulim.bsky.social · 02/05/2025
Hi, this is my new professional account :) I'm a mathematician working on geometry and topology of data. Recently I'm focused on Bobrowski-Skraba's universal statistical law of persistent homology, and also neuroscience applications - toroidal grid cell topology.
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Uzu Lim @uzulim.bsky.social · 26/06/2024
helo
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Uzu Lim @uzulim.bsky.social · 25/06/2024
would u accept "shittification" also theres a math word called "sheafification"
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Uzu Lim @uzulim.bsky.social · 24/06/2024
me soon
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Uzu Lim @uzulim.bsky.social · 23/06/2024
더불어 저 본인도 upper middle class으로 세상을 다분히 비뚤어지게 봤는데, 여러 이유로 이제는 좌파로 정체화하게 됐어요. 더 정직하고 바르게 살 수 있게 됐어요.
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Uzu Lim @uzulim.bsky.social · 23/06/2024
카투사로 일할때 미국 유학간 애들이 다 그런 느낌이었어서 여러모로 인상이 안좋게 박힌 기억이 나네요.
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Uzu Lim @uzulim.bsky.social · 23/06/2024
he seemed viral in south korea, what's big about him?
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Animal Aspects (Art History Animalia) @animal-aspects.bsky.social · 23/06/2024
For #WorldCamelDay 🐪🐫: 4 figurines of Bactrian #Camels Yotkan, Xinjiang, China, 1st–6th c. CE Clay, H 7.6, 6.0, 3.8, 3.3 cm British Museum collection MAS.24, MAS.8, 1902,1220.375, MAS.25: www.britishmuseum.org/collection/o...
Official museum photo of four small clay figurines in the form of Bactrian Camels (two humps), with details such as facial features, fur, harnesses, etc. suggested by incised lines; aranged in a line left to right from largest to smallest in side profile against orange background.
#1 Height: 7.60 cm / Width: 8 cm
#2 Height: 6 cm / Width: 5.20 cm
#3 Height: 3.81 cm / Width: ?
#4 Height: 3.30 cm / Width: 4 cm
Image © The Trustees of the British Museum (CC BY-NC-SA 4.0)
https://www.britishmuseum.org/collection/object/A_MAS-24
https://www.britishmuseum.org/collection/object/A_MAS-8
https://www.britishmuseum.org/collection/object/A_1902-1220-375
https://www.britishmuseum.org/collection/object/A_MAS-25
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Steve Nellis @snellis.bsky.social · 23/06/2024
🌱Lark Ascending. A stunning performance this season. Only more good things to come.
DA Rosa Lark Ascending. A pale white rose that opens with a glowing butter yellow center.
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Uzu Lim @uzulim.bsky.social · 22/06/2024
reminds me of the "The Boring Side" that the ingredient lists get written as for the "hip" companies like Oatley and Aussie
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이적행위🎗🏳️‍🌈🌹☂️🇵🇸 @yijuckhangwe.bsky.social · 22/06/2024
나미비아 대법원이 동성애를 범죄화한 식민지 시대의 법률 두 개를 위헌이라고 결정했다. www.womennews.co.kr/news/article...
womennews.co.kr
나미비아 고등법원, 식민시대 제정된 동성애 금지법 "위헌"
나미비아 대법원이 동성애를 범죄화한 식민지 시대의 법률 두 개를 위헌이라고 결정했다.21일(현지시각) 로이토통신에 따르면 나미비아 대법원은 영국 인권단체의 지원을 받은 시민사회단체 HDT(Human Dignity Trust) 활동가 프리데 다우사브가 제기한 헌법소원에서 위헌결정을 내렸
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Uzu Lim @uzulim.bsky.social · 22/06/2024
smel flowa every day........ lov is everywhere
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Uzu Lim @uzulim.bsky.social · 22/06/2024
@nyuvyu.bsky.social bee kind
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Uzu Lim @uzulim.bsky.social · 22/06/2024
hi angel wow...
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이적행위🎗🏳️‍🌈🌹☂️🇵🇸 @yijuckhangwe.bsky.social · 21/06/2024
어떤 차별은 공기처럼 존재한다. 어느새 소수자를 에워싼다. 소수자는 차별의 시선을 스스로 내면화하기에 이른다. 모욕에 가까운 차별을 당해도 피해망상은 아닐까 자기검열하는 식이다. 섣불리 부당하다고 말했다가는 혐오의 표적이 될 수도 있다. 결코 사소할 수 없는 소수자의 감정을 캐시 박 홍 UC버클리대 교수는 ‘마이너 필링스(minor feelings·소수적 감정)’라고 이름 붙였다. m.khan.co.kr/culture/cult...
m.khan.co.kr
“인간이 가끔 엉망일지라도···차별에 맞선 싸움은 계속된다” [플랫]
어떤 차별은 공기처럼 존재한다. 어느새 소수자를 에워싼다. 소수자는 차별의 시선을 스스로 내면화하기에 이른다. 모욕에 가까운 차별을 당해도 피해망상은 아닐까 자기검열하는 식이...
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Uzu Lim @uzulim.bsky.social · 21/06/2024
helo! good moring
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Uzu Lim @uzulim.bsky.social · 21/06/2024
꽁꽁
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Uzu Lim @uzulim.bsky.social · 21/06/2024
it's in the stars, it's in the smiles
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Uzu Lim @uzulim.bsky.social · 20/06/2024
nooo
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Effin' Birds @effinbirds.com · 20/06/2024
A painting of a bird beside the text "motherfucker do you need a nap?"
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Uzu Lim @uzulim.bsky.social · 20/06/2024
me i want to play let's kick balls
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Uzu Lim @uzulim.bsky.social · 20/06/2024
hello! i eat crupet
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lukelukeluke @lukelukeluke.bsky.social · 19/06/2024
Here are some nice mushrooms
An upward shot of the aging gills of a cluster of summer oyster mushrooms growing on a fallen maple log under a green forest canopy and behind it all a blue sky
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Uzu Lim @uzulim.bsky.social · 20/06/2024
cake and baby cakes diply.com/139442/the-p...
diply.com
The Piping Plover Is A Tiny Endangered Shorebird With The Cutest Babies Ever
The teeny chicks leave the nest right away to toddle around on the sand.
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Uzu Lim @uzulim.bsky.social · 20/06/2024
AI generated sea slug :0 scubahanknyc.com/2023/09/13/a...
scubahanknyc.com
Artificial intelligence Nudibranch
Vivid image of a nudibranch, drawing inspiration from the visuals found on my website.
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Uzu Lim @uzulim.bsky.social · 20/06/2024
just bug thoughts www.chesapeakebay.net/discover/fie...
chesapeakebay.net
Piping Plover
Piping plover is a small, sand-colored bird that nests along the Atlantic Coast.
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