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Hendrik Weimer

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

19 followers 5 following 257 posts

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

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 02/10/2026

While I was working on my diploma thesis, I wrote four papers in one year, three of them as first author. While this might sound impressive for someone not having even started a PhD, I wasn't happy with it. It felt shallow, and I didn't have the impression that I was meaningfully helping to […]

fediscience.org

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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

This affects when someone on your Nextcloud instance is sharing a folder with your account. Anonymous URL shares don't seem to work at all with nextcloudcmd. My workaround, in case someone else gets bitten by this: Log into your Nextcloud instance and open the shared folder in the web interface […]

fediscience.org

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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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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 26/09/2026

@rstockm Ich schwanke auch regelmäßig zwischen "Unable to decrypt message" und "error downloading image". Das liegt aber nicht am Matrix-Protokoll sondern an dem grottigen Element-Client. Davon gibt es wohl zwei Versionen, eventuell ist die von Behörden und Streitkräften eingesetzte proprietäre […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 23/09/2026

@leanderlindahl I guess when you are already a prominent participant of the public discourse, you don't have great interest in leveling the playing field.

Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 23/09/2026

@ftranschel @MMagdowski Bei Matplotlib sind 3D-Plots mit den Standardeinstellungen schnell jenseits von 10 MB. Man kann die Plots mittels set_rasterized beim Speichern rastern und die Achsen etc. als Vektorgrafiken belassen, ist aber nicht ganz trivial.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 21/09/2026

@tomstafford @giorgiogilestro Good ideas are still a scarce resource and LLMs don't really help with that. While we don't need more write-only papers, we would certainly benefit from having better ideas.

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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 […]

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

@defnull @rstockm It's pretty much unavoidable that metrics on social media are heavy-tailed, meaning they are sensitive to single events. You will always have some most viral posting in your posting history.

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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 […]

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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 · 09/09/2026

@tomkalei My impression is that when these big problems were put up, the idea was that solving them would probably require new deep insights that would also be of use in countless other situations. I'm by no means an expert in this, but as far as I know, this view holds reasonably well for the […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 05/09/2026

@tomkalei What makes you sure that it's not exploiting a bug in the proof assistant? Naively, I would expect that there is a threshold when theorems are so hard to prove that it's statistically more likely to be an exploit rather than an actual result. Kind of an AI version of "Why Most […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 05/09/2026

@tomkalei @berlinfediday @54gradsoftware Interessant. Über mich gibt es auch einen Eintrag, sogar mit Mastodon-Handle: www.wikidata.org/wiki/Q90384150 Ich hatte mal versucht, mir alle Physiker auf Mastodon ausgeben zu lassen, da ist das aber nicht aufgetaucht. War mein SPARQL-Fu wohl […]

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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 · 27/08/2026

@ditsch42 If it's from 2019, it's very likely that it has unpatched firmware vulnerabilities because the vendor has stopped caring about that generation a long time ago. If we are talking about the Qualcomm Snapdragon 632 in the Fairphone 3, the last firmware update appears to be from 2020. And […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 27/08/2026

@tomkalei Kennt @faktorbot auch so Sachen wie 2140324650240744961264423072839333563008614715144755017797754920881418023447140136643345519095804679610992851872470914587687396261921557363047454770520805119056493106687691590019759405693457452230589325976697471681738069364894699871578494975937497937?

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 26/08/2026

@ditsch42 Ich vermute stark, dass es keine gute Idee ist, dort einen Brocken elementares Lithium reinzuwerfen... Insofern richtig und wichtig, auf Lithiumionen zu bestehen.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 18/08/2026

@tomkalei Large parts of theoretical physics have already moved from problem solving to asking which problems are interesting (and solving them at the same time). So, it's less about technical abilities but more about creativity, exploration, and connecting different areas. Not because of LLMs […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 14/08/2026

@leanderlindahl Most German cities have more daily postings under their hashtag on the Fediverse than on X or Bluesky. Did the politicians suddenly arrive to be where the people are? Nope. Even in Berlin, where Mastodon is incorporated, none of the big guns have shown up. My impression is […]

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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 · 11/08/2026

@yoginho @brembs Sure, but if you can only differentiate between living organisms and autonomous Turing machines because you have defined the latter away, that's kind of weak, don't you agree?

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/08/2026

@brembs @yoginho I'd rather go with "Turing-complete cellular automaton". You can't get any more impossible to predict all its capabilities and functions than that.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/08/2026

@HagenDomaschke Naja, zunächst werden sie es bei der Empfängeranschrift versuchen. Hängt dann natürlich davon ab, wie groß die Chancen sind, dass man zuhause ist oder Nachbarn die Sendung für einen annehmen. Das ist natürlich stark mit privilegierten Lebens- und Wohnverhältnissen korreliert […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/08/2026

@HagenDomaschke Wenn du Verbraucher bist, ist die Sendung in der Packstation noch nicht dein Eigentum, deswegen ist es schwierig da was zu machen. Dass sie für den Widerspruch eine E-Mail-Adresse haben wollen ist auch kaum DSGVO-konform und nicht gerade vertrauensfördernd. Mir ist auch nicht […]

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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 […]

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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 […]

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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 […]

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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 · 29/06/2026

@echo_pbreyer Ich muss gestehen, dass ich da überhaupt nicht mehr durchsteige. Chatkontrolle 1.0 heißt, dass Plattformen freiwillig Inhalte scannen dürfen, richtig? (Mein Mitleid mit Nutzern von WhatsApp und Co. ist an der Stelle begrenzt, aber gut.) Der zweite Link schreibt aber von einer […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 23/06/2026

@dujmovivo Dafür, dass hier niemand ist, gibt es hier aber mehr Postings pro Tag unter dem Hashtag #karlsruhe als auf X, wofür die lokale CDU auf ihrer Webseite Werbung macht. Das ist inzwischen in den meisten deutschen Großstädten der Fall. Soviel zum Thema "man muss die Menschen dort treffen […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 21/06/2026

@tomkalei Ich glaube, da nimmt man eher 20 RTX 3090, anders lassen sich solche Preise kaum realisieren.

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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

@osma If there is only 4% of free float, than the index weight is also only 4% of the market capitalization.

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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 […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/06/2026

@kossa @AwetTesfaiesus Wenn sich im Insolvenzfall der Wert der Anteile von ehemals sehr viel auf Null entwickelt hat, dann bezweifel ich doch, dass da irgendwer lacht und pfeift.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/06/2026

@kossa @AwetTesfaiesus Naja, sie haften mit dem Teil ihres Privatvermögens, den die Anteile am Unternehmen ausmachen. In der Regel ist das ja durchaus ein erheblicher Anteil.

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 10/06/2026

@AwetTesfaiesus Muss man nicht bei den Kapitalerträgen noch die gezahlten Unternehmenssteuern berücksichtigen? Das sollen typischerweise um die 25% sein. Wenn man da noch die 25% Abgeltungssteuer draufrechnet kommt man am Ende auf eine gesamte Steuerbelastung von 43,75%, was jetzt nicht so weit […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 03/06/2026

@annaneumaier.bsky.social Ich glaube nicht, dass die meisten dagegen sind, die eigenen Leute zu entfristen. Es ist das Entfristen der Leute der Anderen, wo die Probleme entstehen.

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

@denzilferreira As I said, audits are pointless if you can't assure that you actually run the code that you've audited. Which you can't if the vendor can remotely install updates to a device.

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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 […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 29/05/2026

@isotopp A large part of the compute demand is that it used to be cheaper to buy more servers compared to writing efficient code. If the price for compute goes up that balance might change. So there is way to substitute cloud computing, which means vendors won't be able to impose arbitrary […]

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Hendrik Weimer @hweimer.fediscience.org.ap.brid.gy · 27/05/2026

@SunDancer I don't think it's a meaningless metric, as it tells you something about the dynamics of a network. You are right that followers are not equal to total reach, but this is not the point here. There's a narrative in the media that Bluesky is the main competitor to X, and for Germany […]

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