Oliver Hahn 🇪🇺
@cosmohahn.bsky.social
120 followers 99 following 43 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 🇪🇺
Reposted by Oliver Hahn 🇪🇺
cosmohahn.bsky.social
Everything has to end. Many exciting talks and discussions how to extract maximum information about #cosmology from #galaxy-surveys and realise the promise of full #field-level-inference during our workshop @esivienna.bsky.social .... videos here (more to come): www.youtube.com/playlist?lis...
Reposted by Oliver Hahn 🇪🇺
esivienna.bsky.social
The week is slowly coming to an end. 🌌 Missed a session? Rewatch talks from Zoltan Haiman, Chiara Moretti, David Alonso & many more here:
www.youtube.com/playlist?lis...
Reposted by Oliver Hahn 🇪🇺
astrobites.bsky.social
What is a CV? How is this different from a résumé? How do I start building a CV? All of these questions and more await within this guide written by many of our authors! 🔭✨☄️
astrobites.org/2025/09/23/g...
Guide to CVs
What is a CV? How is this different from a résumé? How do I start building a CV? All of these questions and more await within this guide!
astrobites.org
Reposted by Oliver Hahn 🇪🇺
Reposted by Oliver Hahn 🇪🇺
esivienna.bsky.social
We’ve just started the workshop Putting the Cosmic Large-scale Structure on the Map: Theory Meets Numerics, organised by @cosmohahn.bsky.social, Cornelius Rampf & Cora Uhlemann. A full week of exciting talks and discussions is ahead. 🌌
📎 Info: www.esi.ac.at/events/e576/
cosmohahn.bsky.social
Very excited to kick off our workshop at @esivienna.bsky.social on "Putting the cosmic large-scale structure on the map" today. Looking forward to a week of discussions around extracting the maximum of cosmological information from astronomical observations. Amazing support by the ESI team. Thanks!
Reposted by Oliver Hahn 🇪🇺
jowolff.bsky.social
I’m in Vienna right now. A city which went from being the intellectual and cultural capital of the world to a “provincial backwater” (to quote Brian Barry) in a couple of decades due to nationalism, anti-semitism and fascism which drove away the leading scholars and artists it didn’t murder.
Reposted by Oliver Hahn 🇪🇺
johncarlosbaez.bsky.social
The United Nations has now ratified the High Seas Treaty, setting the stage to create huge conservation zones in international waters, covering 30% of the world's oceans!

highseasalliance.org/2025/09/19/h...
A whale's tail poking up from the ocean on a cloudy day.

Robert F. Bukaty/Associated Press
Reposted by Oliver Hahn 🇪🇺
startswithabang.bsky.social
What is the true purpose of scientific peer review?

#AskEthan

Passing peer review isn't "crossing the finish line" where every claim inside has now been verified to be correct.

Instead, it's "crossing the start line" by science's high standards.

bigthink.com/starts-with-...
#science #space
Ask Ethan: What is the true purpose of scientific peer review?
Just because a paper passes peer review doesn't mean that what's written, or what the author asserts, is true. Here's why it still matters.
bigthink.com
Reposted by Oliver Hahn 🇪🇺
stellarorigins2025.bsky.social
150 top scientists from around the World came to Vienna to discuss about the state-of-the-art on star formation studies! 🔭
#stellarorigins2025
cosmohahn.bsky.social
Well, dark energy does have affect on wrinkles...
cosmohahn.bsky.social
hahaha. feel free to send your own any day though...
cosmohahn.bsky.social
Also so very tired of this... In the attention economy, random cheap attacks and borderline crackpottery increasingly outshine the hard work of actual scientific discovery...
Reposted by Oliver Hahn 🇪🇺
rahmstorf.bsky.social
Wow. The US Energy Department has withdrawn its scam climate report and disbanded its „Climate Working Group“ in order to dodge a law suit against the scam.
They must have realized that this scam report by a few „climate skeptics“ is indefensible nonsense.

subscriber.politicopro.com/article/2025...
POLITICO Pro: DOE says it dissolved research group that wrote its controversial climate report
The department said the end of the Climate Working Group means environmental groups' complaint over alleged Federal Advisory Committee Act violations is no longer valid.
subscriber.politicopro.com
cosmohahn.bsky.social
Why are all the people that send me their theories of everything men?
cosmohahn.bsky.social
I love the idea! Let’s look forward to the day when every person follows their calling and is no longer discouraged (even unconsciously) by any parent, relative, or teacher…
Reposted by Oliver Hahn 🇪🇺
notdred.bsky.social
Amazingly enough I am on this list *multiple times* because of scholarly articles I coauthored. You should really check and see if you’re on it too.
ryanestrada.com
Just a reminder to check for your name in this list of books that OpenAI trained from. If your name is there, they probably owe you several thousand dollars.

OpenAI cried that if everyone eligible author files, the company will go bankrupt, so I'm alerting every author I have ever spoken to.
Search LibGen, the Pirated-Books Database That Meta Used to Train AI
Millions of books and scientific papers are captured in the collection’s current iteration.
www.theatlantic.com
Reposted by Oliver Hahn 🇪🇺
mikegalsworthy.bsky.social
"Reform has touted its plan as a “legal reset”. But it is better understood as a total rejection of the UK’s postwar international commitments to protect the human rights of everyone within its jurisdiction."
Treaties like the ECHR protect everyone in the UK, not just migrants
These commitments have cemented the UK at the heart of the rules-based international order.
theconversation.com
Reposted by Oliver Hahn 🇪🇺
rahmstorf.bsky.social
The DOE scam climate report tries to deny the obvious observed fact that sea-level rise has been accelerating.
A statistician explains in his blog:
tamino.wordpress.com/2025/09/06/b...
It’s a long predicted physics effect of a warming planet: continental ice melts faster the warmer it gets.
Bad Science on Sea Level
In a recent report about climate change from the U.S. Department of Energy (DoE), the authors state that “U.S. tide gauge measurements reveal no obvious acceleration beyond the historical ave…
tamino.wordpress.com
cosmohahn.bsky.social
I find the idea of taking the euro to zero interesting...
cosmohahn.bsky.social
I'd like to think they remind me of the ends of computability in Gödel's sense, but it's always just the profanity of a bug...