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Oliver Hahn 🇪🇺

@cosmohahn.bsky.social
190 followers 132 following 67 posts

Computational Cosmologist, Simulator of Universes, Producer of NaNs, Prof @univie.ac.at, opinions solely my own, (he/him), 334ppm

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Reposted by Oliver Hahn 🇪🇺
Astronomer Royal for Scotland | Catherine Heymans @astroroyalscot.bsky.social · 01/07/2026
At today's UKRI board meeting, the fate of UK particle physics and astronomy will likely be decided. Have we done enough to convince the powers-that-be to halt the proposed funding cuts? 🤞 Read Prof. Hiranya Peiris in Nature today eloquently explaining why these cuts are wrong.🧪🔭⚛️ 📖: rdcu.be/friwM
Restructuring research funding as a choice between discovery and application gets the economics wrong, the evidence wrong and the people wrong.

A premise is gaining traction in science policy on both sides of the Atlantic: that fundamental and applied research are competing claims on the same budget, and that the balance must shift towards application. In the USA, the current administration has proposed cuts of billions of dollars to the National Institutes of Health and the National Science Foundation. In the UK, the national funding agency UK Research and Innovation (UKRI) is restructuring its portfolio around government growth priorities, with curiosity-driven research nominally protected but the grant lines that actually fund investigators under severe pressure. The language varies — ‘doing fewer things better’, ‘aligning research with industrial strategy’ — but the underlying logic is the same. Fundamental science, the argument goes, is a luxury that becomes dispensable when budgets are tight. This premise is wrong, and the consequences of acting on it are already visible.
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Richard Easther @rjme.bsky.social · 01/07/2026
Piece on the UK's mistakes in science funding, which parallel the disaster we have made for ourselves in New Zealand. (Written by the awesome Hiranya Peiris) www.nature.com/articles/s42...
nature.com
Discovery is not the opposite of application - Nature Reviews Physics
Restructuring research funding as a choice between discovery and application gets the economics wrong, the evidence wrong and the people wrong.
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Universität Wien / University of Vienna @univie.ac.at · 18/06/2026
📣 Event tip: Data Science + AI Day 2026 „Advancing Artificial Intelligence We Can Trust and Understand" 🔬 @ds-vienna.bsky.social invites to an #AI showcase on June 22 — panels & keynotes highlighting how Vienna's university researchers are advancing interpretable AI systems we can trust. 🔍 More: ⤵️
datascience.univie.ac.at
Data Science & AI Day 2026
Data Science & AI Day 2026
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Denis Erkal @derkal.bsky.social · 10/06/2026
The Arrakihs mission has been adopted as ESA's next F-class mission, with an expected launch in 2030! It will look at the low surface brightness outskirts of 80 Milky Way-like galaxies. www.esa.int/Science_Expl...
esa.int
ESA adopts galactic archaeology mission Arrakihs
The European Space Agency’s (ESA) Science Programme Committee has adopted the Arrakihs mission. Planned for launch by the end of 2030, Arrakihs will capture the faint light from nearby galaxy haloes. ...
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Julia Partheymüller @schnizzl.bsky.social · 22/05/2026
Alle Demos nächste Woche: Wien: Mi, 27.05., 13 Uhr, Uni Wien Linz: Do, 28.05., 16 Uhr, Hauptplatz Graz: Do, 28.05., 14 Uhr, Wilhelm Fischer Allee Salzburg: Do, 28.05., 14 Uhr, Kapitelplatz Klagenfurt: Do, 28.05., 10 Uhr, Uni-Vorplatz www.oeh.ac.at/info/unisret... #UnisRetten @nuwiss.bsky.social
oeh.ac.at
Sparkurs stoppen - #UnisRetten! - Österreichische Hochschüler_innenschaft (ÖH)
Milliardenkürzungen bei den Unis? Nicht mit uns! Gemeinsam mit den Universitäten gehen wir als Studierendenvertreter_innen auf die Straße.
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Emily Hunt @emily.space · 20/05/2026
The Austrian government has proposed hitting universities with an €800 million / year budget cut (after inflation). This could lead to redundancies for up to 20% of staff. 🫠 Quite ironic after the last year of advertising Austria as a "safe haven" for researchers impacted by Trump.
derstandard.at
Eine Milliarde weniger Budget: Unis drohen der Regierung und sagen ihr den Kampf an
Kommenden Mittwoch wollen die Rektorinnen und Rektoren am Ring demonstrieren. Aus Protest steigen sie auch aus dem Hochschulstrategieprozess des Wissenschaftsressorts aus
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Julia Partheymüller @schnizzl.bsky.social · 17/05/2026
🧵1/13 Morgen startet Pint of Science – das Wissenschaftsfestival! 🧠🔬 Vom 18.–20. Mai gibt es in Wien 30 Events an 11 Locations – Forschung zum Zuhören, Fragenstellen & Mitdiskutieren! Ein Überblick über das Programm im Thread. 👇 🎟 pintofscience.at/events/wien/ #pint26 #pint26AT
Screenshot der Pint-of-Science-Wien-Seite mit Übersicht zu den Veranstaltungen in Wien. Oben ist die Navigationsleiste mit Logo, Festivaldatum 18.–20. Mai 2026 und Menüpunkten zu sehen. Darunter steht links „Wien Veranstaltungen“ mit einem Auswahlfeld für die Stadt Wien. Rechts ist eine Stadtkarte von Wien mit mehreren Markierungen für die verschiedenen Veranstaltungsorte.

1.	WerkzeugH – Unsere Gesellschaft 
2.	das GRU – Tech Me Out 
3.	Cafe Henriette – Von Atomen zu Galaxien 
4.	Tachles – Planet Erde / Unser Körper / Tech Me Out (Englisch) 
5.	Beavers Pub – upstairs – Planet Erde 
6.	Polkadot – Planet Erde / Von Atomen zu Galaxien / Unsere Gesellschaft (Englisch) 
7.	Beavers Pub – downstairs – Beautiful Mind 
8.	Das Jetzt – Planet Erde 
9.	Anton Frank – Von Atomen zu Galaxien 
10.	Café Benno – Special / Wissenschaft & Demokratie (Englisch) 
11.	Club Berlin – Unser Körper
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Ethan Siegel @startswithabang.bsky.social · 11/05/2026
A brief history of the cosmic distance record The cosmic distance record has grown, in just a few hundred years, from millions of light-years to over 30 billion light-years. Here's a look back at our history of ever-receding horizons. bigthink.com/starts-with-... #space #astro #physics #telescope
bigthink.com
A brief history of the cosmic distance record
Only nearby objects appear to the naked eye. With telescopes of all types, especially in space, we've smashed those records many times over.
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Ethan Siegel @startswithabang.bsky.social · 21/04/2026
Dark matter passes a new cosmic test, while MOND fails A new cosmic test has finally, with CMB and large-scale structure data, become realistic: using the kinetic Sunyaev-Zel'dovich effect to test dark matter vs. MOND. Guess who wins? bigthink.com/starts-with-... #space #astro #darkmatter #MOND
bigthink.com
Dark matter passes a new cosmic test, while MOND fails
On cosmic scales, only dark matter (or something equivalent) gives us the Universe we observe. Now, the Sunyaev-Zel'dovich effect agrees.
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 15/04/2026
Freu mich diesmal auch dabeizusein!
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 15/04/2026
Very excited to be part of this year's #PintOfScience festival in Vienna (May 18-20). Many interesting topics and fun opportunities to chat about science pintofscience.at
pintofscience.at
Pint of Science AT
Bringing researchers to your local bar or cafe to share the latest happenings in the world of science.
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McSweeney's @mcsweeneys.net · 05/04/2026
"By week one, I was already tired of his anti-rich, pro-Samaritan bullshit. I wanted to take a course in Christianity, not liberalism."
buff.ly
Selected Negative Teaching Evaluations of Jesus Christ
Our 4th most-read article of 2022. CALENDAR 2027 3/31/24 4/13/25 4/5/26
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 02/04/2026
Just realising that @johncarlosbaez.bsky.social 's classic crackpot index criterion #15 might need an update. AI readily solves this little obstacle: "I'm not good at math, but my theory is conceptually right, so all I need is for someone to express it in terms of equations".
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Romston @romston.bsky.social · 01/04/2026
🦈 Rare picture of a shark stepping on a Lego. #MadeMeSmile 🤭
A shark head out of the water. Its mouth is open. It looks like it's screaming.
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John Bistline @bistline.bsky.social · 01/04/2026
This is my favorite climate change chart. Japanese monks, aristocrats, and emperors kept meticulous records of cherry blossom festivals for 1,200 years and accidentally built the world's longest climate dataset.
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Ethan Siegel @startswithabang.bsky.social · 01/04/2026
The flimsy case for evolving dark energy There's been a lot of talk about evolving dark energy, and how DESI data demands it. But the case for this remains somewhat weak, while the true underlying puzzles remain unsolved. bigthink.com/starts-with-... #physics #astro #space #darkenergy
bigthink.com
The flimsy case for evolving dark energy
Is dark energy evolving with at least 99.99% confidence? Despite the quality of recent data, scientists have every reason to be skeptical.
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Claire Lamman @clairelamman.bsky.social · 27/03/2026
So happy to finally share this: I made a long-form comic about Hawking radiation for Physics Today! Although it's a short read, I hope it sucks you in ;) physicstoday.aip.org/features/bla...
physicstoday.aip.org
Black holes aren’t black
A half century after the discovery of Hawking radiation, we are still dealing with the quantum puzzle it exposed.
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 26/03/2026
it's not a pigeon, it's a feature...
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Emanuel Maiberg @emanuelmaiberg.bsky.social · 26/03/2026
after much deliberation and giving AI the benefit of the doubt, Wikipedia editors have had enough of AI slop. New policy bans LLM generated content, periodt www.404media.co/wikipedia-ba...
404media.co
Wikipedia Bans AI-Generated Content
“In recent months, more and more administrative reports centered on LLM-related issues, and editors were being overwhelmed.”
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David Ho @davidho.bsky.social · 25/03/2026
Not so marvelous news. ~95,000 scientists have left the federal government since the Trump regime took over.
nytimes.com
Prominent Climate Scientist Resigns From NASA, Citing Trump’s Attack on Science
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Space Telescope Science Institute @stsci.edu · 23/03/2026
Watch as the Crab Nebula changes over time with Hubble. Two images, taken 25 years apart, show the ongoing expansion of a supernova remnant: news.stsci.edu/4bAN6m4 🔭
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Jo Wolff @jowolff.bsky.social · 23/03/2026
Christ on an electric bike. Trump Administration to Pay $1 Billion to Energy Giant to Cancel Wind Farms www.nytimes.com/2026/03/23/c...
nytimes.com
Trump Administration to Pay $1 Billion to Energy Giant to Cancel Wind Farms
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Peter Coles 🏳️‍🌈 🏳️‍⚧️ 🇮🇪 @telescoper.bsky.social · 06/03/2026
Good move! www.cnrs.fr/en/update/cn...
cnrs.fr
The CNRS is breaking free from the Web of Science
From January 1st 2026, the CNRS will cut access to one of the largest commercial bibliometric databases, Clarivate Analytics'
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NSF–DOE Rubin Observatory @rubinobservatory.org · 25/02/2026
The largest spot-the-difference effort EVER has begun!🚨 On the night of Feb 24, NSF–DOE Rubin Observatory officially released its first ~800,000 public alerts of detected changes in the night sky!🔍 A new era of discovery is here✨ 🔭🧪☄️ 🔗: rubinobservatory.org/news/first-a...
Illustrated graphic with the boot-shaped Rubin Observatory atop its site on Cerro Pachón beneath a sparkling night sky and the glowing band of the Milky Way stretching from lower left to upper right. Sprinkled throughout are many "Data alert!" popups, labeled with icons that represent supernovae, asteroids, hungry black holes, and more.A 3-by-4 grid of grayscale astronomical images zoomed in on single objects. From left to right, the columns are labeled Template, New image, and difference. From top to bottom, the rows are labeled supernova, variable star, active galactic nucleus, and solar system object.
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LIGO Scientific Collaboration @ligo.org · 11/02/2026
What has happened in the 10 years since #GW150914? @space.com picks their top 10 discoveries. What are yours? www.space.com/astronomy/li... by @robleascijorno.bsky.social #GW10Years 🔭 ⚛️ 🧪
Article screenshot:

LIGO Legacy: 10 incredible gravitational wave breakthroughs to celebrate observatory's landmark 2015 find

By Robert Lea published September 14, 2025
A lot has happened in gravitational-wave astronomy over the past decade.

An illustration of binary black holes ringing space-time with gravitational waves (Image credit: LIGO/T. Pyle)
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Peter Suber @petersuber.bsky.social · 11/02/2026
A review of the proceedings from four major computer-science conferences showed that none from 2021, and all from 2025, had fake citations. arxiv.org/abs/2602.058... #AI #LLMs #Hallucinations #Misconduct #ScholComm
arxiv.org
The Case of the Mysterious Citations
Mysterious citations are routinely appearing in peer-reviewed publications throughout the scientific community. In this paper, we developed an automated pipeline and examine the proceedings of four ma...
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Nereide @drnereide.bsky.social · 11/02/2025
🧪 🔭🧵 #histsci #February11 is International Day of Women & Girls in Science. So I would like to highlight Katherine Johnson, #NASA mathematician and computer scientist. A biography➡️ nasa.gov/centers-and-... She was a trailblazer in the quest for racial equality and, as a champion of STEM education,
The image shows Katherine G. Johnson smiling working at the Spacecraft Controls Branch of NASA in 1966.
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Tim O'Brien @proftimob.bsky.social · 08/02/2026
More on catastrophic cuts to UK astronomy & particle physics. Costs of facilities & international subscriptions go up so grants line and individual projects are cut. If the Government is serious about backing science & technology, they need to fix this. www.space.com/astronomy/uk...
space.com
UK government proposes 30% budget cut to astronomy and physics research: 'It's pretty disastrous'
"You can't have a cut of that scale and not expect to see a massive impact."
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Chanda Prescod-Weinstein 🌌 @chanda.blacksky.app · 06/02/2026
Elon Musk et al are totally fucking up the night sky ALREADY and they plan to make it worse 🔭 www.skyatnightmagazine.com/news/satelli...
skyatnightmagazine.com
Are we destroying our window to the cosmos? Satellite trails could make space science nearly impossible, say astronomers | BBC Sky at Night Magazine
Projected 560,000 satellites could overwhelm future observatories. Astronomers worry satellite trails will mar every view of the Universe.
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Peter Gleick @petergleick.bsky.social · 05/02/2026
Perhaps it was coincidental timing, but nothing underscores the collapse of the Washington Post like firing most of the Pulitzer prize winning #climate reporters the very same day as their opinion pages publishes a BS screed by climate misinformer Bjorn Lomborg.
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Michael E. Mann @michaelemann.bsky.social · 15/01/2026
Here's the data:
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Ethan Siegel @startswithabang.bsky.social · 11/01/2026
Starts With A Bang podcast #125 – Large-scale structure Here at the start of 2026, the biggest puzzles in the expanding Universe are the Hubble tension and the question of whether dark energy evolves. Two cosmologists, me and Kate Storey-Fisher, discuss. bigthink.com/starts-with-... #space #astro
bigthink.com
Starts With A Bang podcast #125 - Large-scale structure
The seeds of cosmic structure that were planted back during the Big Bang grew into the cosmic web we see today. What is it telling us?
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Christoph Dellago @chhdellago.bsky.social · 28/12/2025
Eine Geburtstagsparty für die Schrödingergleichung gibt's am 22-23 Jänner am @esivienna.bsky.social www.esi.ac.at/events/e596/
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John C. Baez @johncarlosbaez.bsky.social · 28/12/2025
Cartoon showing academic publisher at the end of a plank over the black void, supported by the weight of academics on the land-end, while one turns away (saying 'fuck this'), the publisher says: 'You will write papers for us & pay us to publish them. You will review those papers fo free. You will also pay us to read those papers'.
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Ethan Siegel @startswithabang.bsky.social · 22/12/2025
How recently have we understood the Universe? The Universe has been around for 13.8 billion years. But it's really only over the most recent millennia, centuries, and decades that humanity has understood it at all. bigthink.com/starts-with-... #space #universe #cosmos #astro
bigthink.com
How recently have we understood the Universe?
While humanity has been skywatching since ancient times, much of our cosmic understanding has come about only recently. Very recently.
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Ethan Siegel @startswithabang.bsky.social · 15/12/2025
Brightest-ever lensed supernova reveals astronomy’s coming revolution Astronomers found our first gravitationally lensed superluminous supernova. With the Vera C. Rubin Observatory now operational, hundreds, maybe thousands more should be coming. bigthink.com/starts-with-... #space #supernova
bigthink.com
Brightest-ever lensed supernova reveals astronomy's coming revolution
With the observation of SN 2025wny, a lensed superluminous supernova, astronomy's future comes into sharp, exciting focus.
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 10/12/2025
It's as if there is a pattern...
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Michael E. Mann @michaelemann.bsky.social · 10/12/2025
#ScienceUnderSiege
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Ele Willoughby @minouette.bsky.social · 09/12/2025
Happy birthday to #mathematician & #computerscientist US Navy rear admiral Grace Hopper (1906-1992) who popularized the revolutionary idea of developing machine-independent programming languages based on English. 🧪🐡👩🏼‍🔬 #histsci She began teaching at Vassar in 31 & got PhD (Yale) 🧵#artAdventCalendar
My linocut print of a young Grace Hopper in uniform in dark navy blue with Mark I computer behind here in dark green and grey and the famous moth in dark gold.
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Daniel Pomarède @pomarede.bsky.social · 08/12/2025
Wow 98,000 peculiar velocities The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue by C.E. Ross and co-authors arxiv.org/abs/2512.03226 For comparison: the Great Attractor was discovered with 400 PVs, Laniakea with 8000 PVs, South Pole Wall with 18,000 PVs #Cosmicflows #Cosmology 🧪
This is Figure 15 of the paper, a Mollweide projection of the distribution of the DESI DR1 Fundamental Plane sample (blue) in Right Ascension and Declination compared to the Cosmic Flows 4 catalogue (Tully et al., 2023, black) and the DESI EDR sample (Said et al., 2024, orange).
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The New Yorker @newyorker.com · 05/12/2025
A cartoon by Charles Barsotti, from 1994. Shop your favorite cartoons: newyorkermag.visitlink.me/ZjVXum[…]id=...
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Österreichischer Wissenschaftsfonds FWF @fwf-at.bsky.social · 03/12/2025
Der #FWF fördert 3 neue #Spezialforschungsbereiche für mehr Grundlagenwissen in der Medizin, Quantenforschung und Kosmologie. Die neuen Netzwerke werden von Forscher:innen der @uniinnsbruck.bsky.social, der @unisalzburg.bsky.social und der @tuwien.at koordiniert. 📚 www.fwf.ac.at/aktuelles/de...
fwf.ac.at
FWF bewilligt drei neue Spezialforschungsbereiche
Mehr Grundlagenforschung in der Medizin, der Quantenforschung und der Kosmologie – der FWF richtet zum Ausbau der Spitzenforschung in Österreich drei weitere Spezialforschungsbereiche ein.
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 03/12/2025
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
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Oliver Hahn 🇪🇺 @cosmohahn.bsky.social · 03/12/2025
Very excited and honoured that we got funding for this exciting new research network with a fantastic group of people.
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Katie Mack @astrokatie.com · 03/12/2025
I haven’t seen this label used before but it seems apt. The video contains a good discussion of what “science populism” is and how it’s harmful. youtu.be/sQnOFGWsXNM?...
youtu.be
Ep 0: The Rise of the Science Populists
YouTube video by Bad Boy of Science
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Daniel Pomarède @pomarede.bsky.social · 01/12/2025
LiteBIRD Mission Takes One Step Forward The next-generation cosmic microwave background (CMB) polarization satellite has been approved to move forward, following a review held at JAXA's Institute of Space and Astronautical Science. #LiteBIRD 🧪 #Cosmology www.ipmu.jp/en/20251201-...
ipmu.jp
LiteBIRD Mission Takes One Step Forward
December 1, 2025 The University of Tokyo Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI)
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Katharina Nocun @kattascha.bsky.social · 29/11/2025
Der Beschluss des Grünen-Parteitags gegen eine Erstattung von Homöopathie durch gesetzliche Krankenkassen ist ein wichtiges Signal. Es geht nicht (nur) ums Geld. Es geht auch um Abgrenzung: Was durch die Solidargemeinschaft finanziert wird, muss wissenschaftlich belegt sein. Die Erstattung führt…
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Matt Salomone @matthematics.com · 29/11/2025
Still among my favorite science memes lol
Two red spinning balls are shown, one labeled +1/2 and its spin oriented positively and another labeled -1/2 and oriented negatively. Caption: "Electron spin explained: imagine a ball that's rotating, except it's not a ball and it's not rotating"
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Leila Belkora PhD, astrophysics @leilabelkora.bsky.social · 12/11/2025
I didn’t know it was this bad at Goddard. Infuriating. 🧪
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Matt Bothwell @mattbothwell.com · 26/11/2025
It was a huge pleasure to be back at the Royal Institution last month! I gave a lecture all about the mysteries of dark matter, which is now up on YouTube. 🧪🔭 (As a bonus, my demo actually worked, unlike in my 2021 Ri talk...!) www.youtube.com/watch?v=bLa3...
youtube.com
The quest for dark matter with Matt Bothwell
YouTube video by The Royal Institution
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