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Hendrik Weimer

@hweimer.fediscience.org.ap.brid.gy

18 followers 5 following 256 posts

Theoretical physicist, professor for condensed matter theory at TU Berlin. #quantum #physics 🌉 bridged from ⁂ fediscience.org/@hweimer, follow @ap.brid.gy to interact

Posts Replies Media

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 28/09/2026

My Zettelkasten is an in:library search in my Mastodon account. #academicchatter #mastodon

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 28/09/2026

Dear @nextcloud, it would be terrific if you could point nextcloudcmd to the URL of a shared folder and you didn't have to manually mess around with the --path argument. #nextcloud

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Reposted by Hendrik Weimer

Jan Penfrat @ilumium.eupolicy.social.ap.brid.gy · 16/09/2026

I am reading the #KIDSAct and oh my is it bad. It is so dumb I have no words. And if adopted as proposed, it will have devastating effects for the #Fediverse and #FOSS app distribution. In particular, it will undo anything good the #DigitalMarketsAct might have achieved there. And it definitely […]

eupolicy.social

Original post on eupolicy.social

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 16/09/2026

Using FediWings (rstockm.github.io/fediwings) by @rstockm, I've calculated the net reach across the Fediverse of German universities during the last 30 days. Here's the top 5: 1. Universität Ulm (@UniUlm): 6860 2. Technische Universität Berlin (@tuberlin): 4315 3. RWTH Aachen […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 16/09/2026

RE: mathe.social/@tomkalei/117270657938… If you believe that AI companies suddenly behave ethically when it comes to not stealing other people's research works, you suffer from a variant of Gell-Mann amnesia. #ai #science

Reposted by Hendrik Weimer

Thomas Kahle @tomkalei.mathe.social.ap.brid.gy · 14/09/2026

Talking about AI today at the DFG SPP Combinatorial Synergies annual conference and I just had to put one of my all time favourite comic strips in. This one panel contains so much. It's 'deep' as we would say in #math.

The comic "Schatz" by Joscha sauer: Pirates find empty treasure chest.
“If you are now wondering where the great
treasure is, then look deep inside yourself and
you will find that it is the friendships and the
experiences you gathered on the long search.”
Whoa! · So beautiful! · Better than gold (struck-out) finite
time blowup for Navier–Stokes.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 13/09/2026

Great tool by @rstockm to estimate the reach of accounts and posts in the fediverse: rstockm.github.io/fediwings This could be especially useful for academic institutions to improve their presence here. #fediverse #mastodon #academicchatter

rstockm.github.io

FediWings | Fediverse Reichweite

Datensparsame Analyse der Reichweite oeffentlicher Fediverse-Beitraege.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 03/09/2026

RE: mathstodon.xyz/@tao/117207856734787… I think this applies to science in general. The real value of science doesn't come from a particular result. The real value of science comes from being a giant so others can stand on your shoulders.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 12/08/2026

RE: fediscience.org/@petersuber/1170772… I will no longer work with PNAS if the National Academy of Sciences no longer stands by its science.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 06/08/2026

The Einstein Foundation Berlin offers four-year postdoctoral fellowships for a wide range of topics, including quantum physics. If your research interests align with one or more topics listed at www.tu.berlin/en/cmt/research and you would be interested to apply with me acting as your […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 04/08/2026

RE: mastodon.social/@marcoarment/117028… If the optimistic claims about agentic AI programming were remotely true, we would have seen a Cambric explosion of awesome software being released by now. Clearly, this hasn't happened. Instead, my impression is that the products […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 20/07/2026

What happens when you have a quantum epidemic, meaning you can be in a superposition state of both healthy and infected at the same time? While this sounds crazy for human diseases, this can actually happen in the atomic world. Turns out that you can have […] [Original post on fediscience.org]

Infected cells (blue dots) can cause others to be in a superposition state of healthy and infected at the same time.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 13/07/2026

Very interesting preprint by @pettertornberg comparing the language indicators for content sharing on different social media platforms. On Mastodon (not sure how much content from the wider Fediverse was included), reasoning and nuance were most strongly associated with boosting. On X, insult […]

fediscience.org

Original post on fediscience.org

Reposted by Hendrik Weimer

Egon Willigh☮gen 🟥 @egonw.mastodon.social.ap.brid.gy · 12/07/2026

congrats to @scipost for their 10 Years Jubilee! scipost.org/news/newsitem/132 Overview of notable journals from @wikidata / @wdscholia: qlever.scholia.wiki/publisher/Q9640… #diamondOA #openaccess #chemistry #physics

qlever.scholia.wiki

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 06/07/2026

PhD admissions in the U.S. down by 15%. www.nytimes.com/2026/07/06/us/resea… #academicchatter

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 17/06/2026

Guess who is now officially exempt from electronic tax filing requirements because there is no tax software for Linux in Germany... #Linux #Germany #taxes

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 15/06/2026

People in charge of something are usually not interested in changing the rules that select who is in charge. #academicchatter #politics

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 13/06/2026

If I find someone to buy a quadrillionth of my company for 1 Euro, does this make me the world's first quadrillionaire?

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 11/06/2026

When people mention "Springer", they can refer to two very different publishers: Springer Nature or Axel Springer SE. Don't confuse them! One does not care about ethical standards, is involved in shady campaigns to exert influence, and employs questionable business practices. The other, of […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 31/05/2026

RE: techhub.social/@denzilferreira/1166… Such an audit is totally pointless because these devices can be remotely updated with any potentially malicious code that DJI or anyone else being able to insert updates sees fit. If you don't trust a software vendor or the country […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 26/05/2026

Very interesting analysis by @netzbegruenung about Mastodon and Bluesky in Germany. For high-profile accounts active on both platforms, the Mastodon accounts saw on average a 193% higher increase in followers over the last six months […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 19/05/2026

@wikipedia is running ads for their mobile app and the Install button redirects to the Google Play Store without warning. This is a pretty obvious GDPR violation. #wikipedia #GDPR #privacy

Ad for Wikipedia's mobile app with a big Install button

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 13/05/2026

RE: fediscience.org/@GeorgWeissenbacher… We're at € 350.49 for everyone, but that includes the semester ticket allowing you to use any public transport in Germany except long-distance trains (which regularly costs already 378 €) […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 04/05/2026

It's great to see that the @volkswagenstiftung has joined the Fediverse! It's hard to underestimate the impact they had on my career, allowing me to start my own research group under a Freigeist Fellowship grant. After almost 10 years, my Freigeist project has come to an end just in the last […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 16/04/2026

Matrix is a complete disaster. Got kicked out of the web client, confirmed my identity using my recovery key. It says that I can now decrypt my old messages, but when I actually try to look at them, it's "Unable to decrypt message" everywhere. As much I applaud my institution's efforts towards […]

fediscience.org

Original post on fediscience.org

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 15/04/2026

RE: mathstodon.xyz/@MartinEscardo/11641… I think this bridging between communities is still useful. But it's also quite incremental work that is unlikely to lead to novel research directions. Personally, I think we were already doing too much incremental work and too little […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 14/04/2026

Having a presence in the Fediverse isn't about reach, engagement metrics, or cost per conversion. It's a civic duty of every organization believing in democratic values. #fediverse #mastodon

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 28/03/2026

In science, large language models are often pretty good when interpolating between known results. That's why they can do your homework with ease. They are absolutely horrible at extrapolation towards genuinely novel ideas. I guess this makes sense as groundbreaking results are exactly those that […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 18/03/2026

RE: mastodon.social/@canartuc/116251066… Or, in the immortal words of the "Bild" tabloid: "German saves the internet: it was a matter of half a second" On a more serious note, the incident reminds us how important it is to have deterministic computers, making such an unexpected […]

fediscience.org

Original post on fediscience.org

Reposted by Hendrik Weimer

Aktionsb. neue soziale Medien @neusom.bewegung.social.ap.brid.gy · 27/02/2026

@everton137 @stereo @zolke.bsky.social According to the listings of @sabrinkmann we have nearly 60 #Mastodon accounts of #universities in Germany 👉 mastodon-listen.playground.54gradso… In addition, there are nearly 150 #research #institutes / organisations 👉 […]

bewegung.social

Original post on bewegung.social

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 24/02/2026

All interesting physics is decentralized and local. If there was a central algorithm deciding what physics is allowed, we wouldn't have the enormous diversity and beauty of the universe emerging out of something like two dozen fundamental physical constants […] [Original post on fediscience.org]

Decentralized error correction on a 2D lattice. Two errors are associated with walkers wᵢ and wⱼ are initially located at the errors The colored numbers indicate the timestep at which a particular walker visits a site. Once a walker encounters a site already visited by the other walker (yellow), the two errors can be fused and removed along the dotted path.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 23/02/2026

Probably the most important insight that you can get from Sonnenwende is that Germany can achieve energy independence with 100% renewables in about 10 years from now using an initial capital investment of 8 billion EUR. And if it can be done in Germany, it can be done almost everywhere. There […]

fediscience.org

Original post on fediscience.org

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 18/02/2026

Some insights I gained from writing and testing Sonnenwende. 1. Solar panels have become so cheap that electricity becomes worthless when the sun is shining. Hence, any government initiative giving guaranteed prices to solar power is mostly a waste of money better spent elsewhere. 2. This has […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 16/02/2026

I wrote a small game simulating the transition to a solar-powered economy. You can build solar panels, batteries, hydrogen storage and sell your generated electricity at market prices. Electricity demand, pricing, and weather conditions are based on realistic […] [Original post on fediscience.org]

Screenshot from the game Sonnenwende, depicting solar panels, batteries, and hydrogen storage tanks.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 04/02/2026

Oh, that's a new one: Just received two different requests to review the same article (sent to two different e-mail addresses). I guess the journal using "AI to find and invite reviewers" might have something to do with this. #academicchatter #ai

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 04/02/2026

Inspired by the recent AGI promotional piece in Nature, here's a suggestion for a test that LLMs will have huge difficulties with: Ask questions outside of its training data and ask for the confidence of the answer being correct. While LLMs might be correct […] [Original post on fediscience.org]

ChatGPT falsely claiming Keir Starmer not being the Prime Minister of the United Kingdom with 100% confidence.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 29/01/2026

Fediverse starter pack for physics with a focus on DE/AT/CH: fedidevs.com/s/ODg2 (h/t @sonjaschuh01) #physics #science #academicchatter #germany #austria #switzerland #fediverse

Physik / Physics de at ch eu - Mastodon Starter Pack

Work in progress - suggestions for the addition of accounts very welcome: individual physicists and physics institutions and organizations alike. In the meantime, see also Astronomy in Germany at https://fedidevs.com/s/NjA2/

Reposted by Hendrik Weimer

David Weir @davidjamesweir.mementomori.social.ap.brid.gy · 28/01/2026

RE: mastodon.social/@europeanphysicalso… The European Physical Society is now posting their materials also on here. Let’s give them a warm welcome and a reason to be even more active. ❤️ #physics

mastodon.social

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 27/01/2026

Together with Mario Birkholz of @neuSoM fame, I have written an article about Mastodon and the Fediverse in the journal of the German Physical Society: pro-physik.de/zeitschriften/downloa… It's free to read but in German. Let's hope that @DPGPhysik's move to the Fediverse will […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 26/01/2026

Topologically ordered states of matter are characterized by fascinating non-local quantum correlations in the many-body wave function. However, deciding whether a quantum state is topologically ordered or not is extremely difficult. A large part of the problem is that so far, signatures like the […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 26/01/2026

So far, my Monday morning has consisted of writing to the editors of a journal that they published a paper containing a drove of AI slop references, helping my much-appreciated instance admin to reject a signup request from a vibe scientist, and dealing with a breach of confidentiality at a […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 25/01/2026

Most boosted Fediverse posts of 2025: 1. @maxleibman: beige.party/@maxleibman/11444179073… (3815 boosts) 2. @stux: mstdn.social/@stux/1139746653646735… (3720 boosts) 3. @pixelfed: mastodon.social/@pixelfed/113849098… (3153 boosts) 4. @signalapp […]

fediscience.org

Original post on fediscience.org

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 14/01/2026

Just been told that the German government plans to introduce legislation to change the Second Law of Thermodynamics, citing the need to dismantle regulatory barriers to the creation of highly efficient combustion engines. #physics #germany #humor

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 12/01/2026

RE: fosstodon.org/@AkaSci/1158796412860… Well, as long as people are complaining about this on X or Substack, things will stay the same. Linus Torvalds didn't change the world by asking Microsoft for its source code.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 07/01/2026

My favorite Python program: a = 8 b = 0 while b != -1: if a % 2 == 0: b += 2 else: b -= 1 a += a//2 print("Hello, world!") Can you figure out what it is doing? It's less than 10 lines, so it surely can't be hard! Context: bbchallenge.org/antihydra #programming #computerscience

bbchallenge.org

The Busy Beaver Challenge

Collaborative research project focused on finding new busy beaver values.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 07/01/2026

Large language models are pretty good for tasks that are hard to solve but easy to verify. A bit like NP-complete problems if you wish, although I wouldn't recommend to solve *actual* NP-complete problems using LLMs. Generating inputs for proof assistants, finding security bugs, and even […]

fediscience.org

Original post on fediscience.org

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Reposted by Hendrik Weimer

Stephen Sekula @steve.mastodon.cooleysekula.net.ap.brid.gy · 14/12/2025

RE: masto.canadiancivil.com/@paige/1157… Echoing this critical advice, especially to #science organizations. If you are a science organization on Bluesky and you want to expand your audience to the open, federated social web, just follow this bridge account. Then I --- an […]

mastodon.cooleysekula.net

Original post on mastodon.cooleysekula.net

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 07/12/2025

RE: machteburch.social/@tomkalei/115680… If you send AI slop to a journal, you should have to pay an article processing charge even though your manuscript gets rejected. #academicchatter