Christian Grefe
@cgrefe.bsky.social
Particle physicist at University of Bonn, working on the ATLAS experiment at CERN. https://orcid.org/0000-0001-7050-5301
Pinned
Christian Grefe
@cgrefe.bsky.social
· Nov 12
I guess it is time for a re- #introduction: I am a researcher at the University of Bonn and work on the @atlasexperiment.bsky.social at CERN. I post mostly about particle #physics, academia in Germany ( #IchBinHanna), and life in Geneva. 🧪⚛️
Was fun to see so many friends and colleagues on the big screen 😃 Not sure when and where "the peace particle" movie will be screened for a wider audience, but I can definitely recommend it.
November 13, 2025 at 10:00 PM
Was fun to see so many friends and colleagues on the big screen 😃 Not sure when and where "the peace particle" movie will be screened for a wider audience, but I can definitely recommend it.
Zählt so ein Social-Media Gig zu den Höchstbefristungszeiten nach WissZeitVG? #IchBinHanna
November 13, 2025 at 9:57 AM
Zählt so ein Social-Media Gig zu den Höchstbefristungszeiten nach WissZeitVG? #IchBinHanna
Die aktuelle Ausgabe des Physik Journal der DPG illustriert einen Artikel mit einem offensichtlich KI-generierten Bild - natürlich ohne Quellenangabe oder sonst irgendeinem Hinweis. Peinlich und vollkommen überflüssig.
November 11, 2025 at 2:35 PM
Die aktuelle Ausgabe des Physik Journal der DPG illustriert einen Artikel mit einem offensichtlich KI-generierten Bild - natürlich ohne Quellenangabe oder sonst irgendeinem Hinweis. Peinlich und vollkommen überflüssig.
Vor 10 Jahren habe ich am CERN eine Schülerpraktikantin im Rahmen des Netzwerks Teilchenwelt betreut. Vorhin kam die Ankündigung für ihr Promotionskolloquium in meinem Postfach an 😊
November 11, 2025 at 7:54 AM
Vor 10 Jahren habe ich am CERN eine Schülerpraktikantin im Rahmen des Netzwerks Teilchenwelt betreut. Vorhin kam die Ankündigung für ihr Promotionskolloquium in meinem Postfach an 😊
Reposted by Christian Grefe
🎤 Are you passionate about science? Show us! 😉
To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.
To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.
November 3, 2025 at 8:24 AM
🎤 Are you passionate about science? Show us! 😉
To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.
To mark the 20th anniversary of FameLab International, CERN is teaming up with FameLab to invite you to share your love for science and win fantastic prizes.
Reposted by Christian Grefe
"Es war nicht eine kleine Zahl von Verbrechern, es waren Hunderttausende einer sogenannten deutschen Elite, Männer, Jungen & entmenschte Weiber, die unter dem Einfluss verrückter Lehren in kranker Lust diese Taten begangen haben."
Thomas Mann
9. November 1938
Thomas Mann
9. November 1938
November 9, 2025 at 7:25 AM
"Es war nicht eine kleine Zahl von Verbrechern, es waren Hunderttausende einer sogenannten deutschen Elite, Männer, Jungen & entmenschte Weiber, die unter dem Einfluss verrückter Lehren in kranker Lust diese Taten begangen haben."
Thomas Mann
9. November 1938
Thomas Mann
9. November 1938
Amateurs 😄 The @atlasexperiment.bsky.social has to detect particle collisions every 25ns (40MHz). Then our first level trigger system has about 2.5 microseconds to analyse and decide whether to keep each of these events and pass it to the second level trigger before the buffers overflow.
November 7, 2025 at 7:40 AM
Amateurs 😄 The @atlasexperiment.bsky.social has to detect particle collisions every 25ns (40MHz). Then our first level trigger system has about 2.5 microseconds to analyse and decide whether to keep each of these events and pass it to the second level trigger before the buffers overflow.
Alle die ein wirklich sicheres Passwort brauchen sollten diesen Empfehlungen folgen: neal.fun/password-game/
November 6, 2025 at 1:46 PM
Alle die ein wirklich sicheres Passwort brauchen sollten diesen Empfehlungen folgen: neal.fun/password-game/
Reposted by Christian Grefe
In honor of the upcoming #WomenInPhysics Day, let's create a thread of amazing women physicists. I'll start with one my favorites, Chien-Shiung Wu, who is best known for conducting the Wu experiment, which proved that parity is not conserved. ⚛️ 🧪 👩🔬 🎢
November 4, 2025 at 10:54 PM
In honor of the upcoming #WomenInPhysics Day, let's create a thread of amazing women physicists. I'll start with one my favorites, Chien-Shiung Wu, who is best known for conducting the Wu experiment, which proved that parity is not conserved. ⚛️ 🧪 👩🔬 🎢
Reposted by Christian Grefe
POV: Preparing to investigate the mysteries of #DarkMatter 🌌
In honour of #DarkMatterDay, we accompanied Baptiste, an @atlasexperiment.bsky.social physicist studying dark matter, as he gears up for his day of detective work.
In honour of #DarkMatterDay, we accompanied Baptiste, an @atlasexperiment.bsky.social physicist studying dark matter, as he gears up for his day of detective work.
October 31, 2025 at 10:59 AM
POV: Preparing to investigate the mysteries of #DarkMatter 🌌
In honour of #DarkMatterDay, we accompanied Baptiste, an @atlasexperiment.bsky.social physicist studying dark matter, as he gears up for his day of detective work.
In honour of #DarkMatterDay, we accompanied Baptiste, an @atlasexperiment.bsky.social physicist studying dark matter, as he gears up for his day of detective work.
Reposted by Christian Grefe
Let's go on a Dark Matter Hunt!
It's almost Dark Matter Day -- also known as Halloween 👻 🎃 -- and I'm really excited to be heading to the STFC’s Boulby Underground Laboratory! This is a unique facility where scientists hunt for the missing matter that makes up our Universe. 🌌
It's almost Dark Matter Day -- also known as Halloween 👻 🎃 -- and I'm really excited to be heading to the STFC’s Boulby Underground Laboratory! This is a unique facility where scientists hunt for the missing matter that makes up our Universe. 🌌
October 29, 2025 at 11:41 PM
Let's go on a Dark Matter Hunt!
It's almost Dark Matter Day -- also known as Halloween 👻 🎃 -- and I'm really excited to be heading to the STFC’s Boulby Underground Laboratory! This is a unique facility where scientists hunt for the missing matter that makes up our Universe. 🌌
It's almost Dark Matter Day -- also known as Halloween 👻 🎃 -- and I'm really excited to be heading to the STFC’s Boulby Underground Laboratory! This is a unique facility where scientists hunt for the missing matter that makes up our Universe. 🌌
Reposted by Christian Grefe
Here’s a gift link to the piece I wrote for @zeit.de:
A history of the Republican Party and a rightwing radicalization, unfolding over decades, that ultimately paved the way for Trump’s rise.
www.zeit.de/kultur/2025-...
A history of the Republican Party and a rightwing radicalization, unfolding over decades, that ultimately paved the way for Trump’s rise.
www.zeit.de/kultur/2025-...
US-Republikaner: Wie sich die Republikaner selbst vernichtet haben
Extremismus und Geschwurbel gehören heute zum Kern der US-Republikaner. In fünf Etappen hat sich die Partei radikalisiert. Und nein, es begann nicht erst 2016 mit Trump.
www.zeit.de
October 29, 2025 at 1:18 PM
Here’s a gift link to the piece I wrote for @zeit.de:
A history of the Republican Party and a rightwing radicalization, unfolding over decades, that ultimately paved the way for Trump’s rise.
www.zeit.de/kultur/2025-...
A history of the Republican Party and a rightwing radicalization, unfolding over decades, that ultimately paved the way for Trump’s rise.
www.zeit.de/kultur/2025-...
Why on earth needs a scientific publisher like Elsevier a "Director of Generative AI"? Why do we need AI-supported peer review? I want to read about original research not some plausible-sounding made up garbage.
October 28, 2025 at 2:54 PM
Why on earth needs a scientific publisher like Elsevier a "Director of Generative AI"? Why do we need AI-supported peer review? I want to read about original research not some plausible-sounding made up garbage.
Applying weights of 100% (last), 90% (1st), 50% (2nd) and 10% for anybody else in larger collaborations is wild, especially if the convention is to publish in alphabetical order 🤨
🧪For those of us who do complex collaborations with multiple corresponding authors this is terrible . I suspect it will also hit female authors disproportionately as they tend to have more collaborations across fields…https://www.nature.com/articles/d41586-025-03281-4
Google Scholar tool gives extra credit to first and last authors
Researchers welcome the initiative, but say it doesn’t go far enough to capture the nuance of researcher productivity and impact.
www.nature.com
October 27, 2025 at 5:30 AM
Applying weights of 100% (last), 90% (1st), 50% (2nd) and 10% for anybody else in larger collaborations is wild, especially if the convention is to publish in alphabetical order 🤨
No large particle collider in China in the near future. "CEPC will not be considered for inclusion in China’s next five-year plan (2026–2030)" ⚛️🧪 cerncourier.com/a/cepc-matur...
CEPC matures, but approval is on hold – CERN Courier
The Circular Electron–Positron Collider (CEPC), a 100-km electron–positron “Higgs factory” proposed in China, has reached the technical-design stage but will not be included for approval or constructi...
cerncourier.com
October 26, 2025 at 4:58 PM
No large particle collider in China in the near future. "CEPC will not be considered for inclusion in China’s next five-year plan (2026–2030)" ⚛️🧪 cerncourier.com/a/cepc-matur...
50000000000000000 proton-proton collisions is a lot of data to analyse. Thanks a lot LHC! To put this in perspective, that should correspond to roughly 30000000 produced Higgs bosons.
Gearing up for higher-luminosity 💫
Yesterday, the Large Hadron Collider hit a new record – 500 inverse femtobarns (fb-1), equivalent to 50 million billion collisions, delivered to the @atlasexperiment.bsky.social and @cmsexperiment.bsky.social since it began operations in 2010.
Yesterday, the Large Hadron Collider hit a new record – 500 inverse femtobarns (fb-1), equivalent to 50 million billion collisions, delivered to the @atlasexperiment.bsky.social and @cmsexperiment.bsky.social since it began operations in 2010.
October 23, 2025 at 2:21 PM
50000000000000000 proton-proton collisions is a lot of data to analyse. Thanks a lot LHC! To put this in perspective, that should correspond to roughly 30000000 produced Higgs bosons.
ZOOM is broken, this will be an interesting day...
October 20, 2025 at 9:06 AM
ZOOM is broken, this will be an interesting day...
Reposted by Christian Grefe
I was interviewed, in German btw, in the context of the #Herkommen project that highlights newcomers in Germany. We talked about international mobility, life as an immigrant, and of course particle physics. Auto-dubbing is available! Or enjoy my Süßes Hollandodeutsch 👼 🇳🇱 🇩🇪 youtu.be/JQqh0lPTsLY?
Freya Blekman – Forschung neu denken, mit Haltung und Vielfalt
Freya Blekman ist Professorin für Physik an der Universität Hamburg und leitende Wissenschaftlerin am DESY. Geboren in Amsterdam, lebte sie in der Schweiz, den USA, England und Belgien, bevor sie…
youtu.be
October 16, 2025 at 5:22 PM
I was interviewed, in German btw, in the context of the #Herkommen project that highlights newcomers in Germany. We talked about international mobility, life as an immigrant, and of course particle physics. Auto-dubbing is available! Or enjoy my Süßes Hollandodeutsch 👼 🇳🇱 🇩🇪 youtu.be/JQqh0lPTsLY?
Physik als Musical und der Hörsaal als Bühne an der @unibonn.bsky.social (ab Minute 13) www.ardmediathek.de/video/lokalz...
WDR Lokalzeit aus Bonn | 13.10.2025 - hier anschauen
Themen: Große Mängel in bundeseigenem Hochhaus | Streit um Turnhallenüberwachung in Bonn | Mikroplastik-Filter gegen Reifenabrieb | Physik als Musical-Show | Studiogespräch: Jana Heysel, Leiterin Phys...
www.ardmediathek.de
October 14, 2025 at 4:31 AM
Physik als Musical und der Hörsaal als Bühne an der @unibonn.bsky.social (ab Minute 13) www.ardmediathek.de/video/lokalz...
Da ist man zwei Wochen nicht in Genf in dann so etwas...
October 5, 2025 at 6:34 PM
Da ist man zwei Wochen nicht in Genf in dann so etwas...
The Briefing Book for the Update of the European Strategy for Particle #Physics is out! It is a summary of the state and the ambitions of the field, summarising the hundreds of community and national white papers we received as input earlier this year. ⚛️🧪 cds.cern.ch/record/2944678
Physics Briefing Book: Input for the 2026 update of the European Strategy for Particle Physics
The European Strategy for Particle Physics (ESPP) reflects the vision and presents concrete plans of the European particle physics community for advancing human knowledge in fundamental physics. The E...
cds.cern.ch
October 1, 2025 at 9:46 PM
The Briefing Book for the Update of the European Strategy for Particle #Physics is out! It is a summary of the state and the ambitions of the field, summarising the hundreds of community and national white papers we received as input earlier this year. ⚛️🧪 cds.cern.ch/record/2944678
Reposted by Christian Grefe
Had never read Jane Goodall's original 1963 article in Nat Geo on the wild chimpanzees in Tanzania until now. It's a wonderful blend of science and journalism, and well worth your time.
www.nationalgeographic.com/pdf/jane-goo...
www.nationalgeographic.com/pdf/jane-goo...
October 1, 2025 at 8:15 PM
Had never read Jane Goodall's original 1963 article in Nat Geo on the wild chimpanzees in Tanzania until now. It's a wonderful blend of science and journalism, and well worth your time.
www.nationalgeographic.com/pdf/jane-goo...
www.nationalgeographic.com/pdf/jane-goo...
Here is an entertaining take on all of those anti-science grifters on YouTube and elsewhere. Highly recommended. youtu.be/miJbW3i9qQc?...
conspiracy physics and you (and also me)
YouTube video by Angela Collier
youtu.be
October 1, 2025 at 6:01 PM
Here is an entertaining take on all of those anti-science grifters on YouTube and elsewhere. Highly recommended. youtu.be/miJbW3i9qQc?...
The physics institute of the @unibonn.bsky.social hosted the US team of this year's Beamline4Schools at our own electron accelerator ELSA. They measured transition radiation photons using various targets, and I had the pleasure to meet them and chat about physics. What a bunch of smart kids!
It’s a wrap for #BL4S 2025 💫
From 10 to 24 September, CERN, DESY and the University of Bonn welcomed the winners of the 2025 Beamline for Schools (BL4S) competition.
Find out more: home.cern/news/news/ce...
From 10 to 24 September, CERN, DESY and the University of Bonn welcomed the winners of the 2025 Beamline for Schools (BL4S) competition.
Find out more: home.cern/news/news/ce...
October 1, 2025 at 4:53 PM
The physics institute of the @unibonn.bsky.social hosted the US team of this year's Beamline4Schools at our own electron accelerator ELSA. They measured transition radiation photons using various targets, and I had the pleasure to meet them and chat about physics. What a bunch of smart kids!
Reposted by Christian Grefe
Difficult for me to put into words how disappointed I am in Sabine Hossenfelder. Many years back when she was just blogging about physics I was a huge fan, and she published a lot of intriguing papers. Now she makes money as a social media arsonist. 🧪
www.mcgill.ca/oss/article/...
www.mcgill.ca/oss/article/...
Sabine Hossenfelder Asks If Science Is Dying. It’s Not.
Physics is dying. It’s mathematical fiction. Science is failing. Most of academic research that your taxes pay for is almost certainly bullshit. I don’t trust scientists. Would you believe me if I tol...
www.mcgill.ca
September 29, 2025 at 7:40 AM
Difficult for me to put into words how disappointed I am in Sabine Hossenfelder. Many years back when she was just blogging about physics I was a huge fan, and she published a lot of intriguing papers. Now she makes money as a social media arsonist. 🧪
www.mcgill.ca/oss/article/...
www.mcgill.ca/oss/article/...