Yannick Kalantzis

Macroeconomist
(own views, not employers’)

[Journal of International Economics @JIntlEcon]

@phbacche @KenzaBenhima @kalantzis @M_Phillot Monetary policy is key to shaping international spillovers of asset market shocks. Outside the ELB, foreign shocks — such as a drop in investment opportunities — can boost domestic growth. At the ELB, the same shocks lead to currency appreciation, disinflation, and even recession

[Journal of International Economics @JIntlEcon]

New at JIE: "The international transmission of asset market shocks in liquidity traps" by Philippe Bacchetta (@phbacche), Kenza Benhima (@KenzaBenhima), Yannick Kalantzis (@kalantzis), Maxime Phillot (@M_Phillot)

https://t.co/CDtG6TaxBq

[euan ashley @euanashley]

New AI paper from us this week. When my student first showed me his initial findings, I really didn’t know what to make of them. I felt that this was an interesting but curious loophole phenomenon that would shortly be closed. I was very wrong.
https://t.co/H3YIyl01FR

[Richard Behiel @RBehiel]

While walking through the legendary 1973 black hole paper by Bardeen, Carter, and Hawking, I spent days convinced I had a sign error in my derivation, which is a very common occurrence for me. Minus signs and factors of two are the bane of my existence.

But, this sign error was persistent. No matter how I looked at it, the math just didn’t work out. Checked it over and over. My physicist friend Nirmalya Kajuri also @Kaju_Nut independently verified my reasoning.

Turns out the sign error is in the paper itself. Actually, there are two subtle errors which cancel each other out, leaving all the physics intact. That’s why it went unnoticed for fifty years.

The moral of the story is that we all make sign errors sometimes, even the greats! But it’s the idea that really matters.

https://t.co/cWH54PcWoM

[Martin Bauer @martinmbauer]

A new result of CMS agrees with LHCb: something is off in b -> sll decays

This is incompatible with Standard Model expectations and remains one of the most puzzling results from the LHC

[Princertitude @princertitude]

1/6 Pourquoi la France produit-elle trop d’essence mais manque-t-elle cruellement de gazole ?
C’est le grand paradoxe de nos raffineries : on exporte des tankers d’essence vers les USA tout en important massivement du diesel.
Explications sur ce casse-tête énergétique.

[Fabien @Fabien_Mikol]

Résolution par GPT-5.4 Pro d'un problème ouvert en théorie des ensembles énoncé en 2019. L'un des mathématiciens auteurs du problème avait envisagé la même approche mais n'était pas parvenu à la résolution malgré plusieurs tentatives. Cette solution est publiable selon lui.

[Martin Bauer @martinmbauer]

The LHCb experiment just announced the discovery a new hadronic state. It has the same quantum numbers as a proton, but instead of up quarks it contains charm quarks

This discovery contributes to a better understand the strong force that keeps quarks bound in nucleons

[Ruijiang Gao @ruijianggao]

What happens when you invite 150 AI economists (Claude Code) to a research conference, give them the exact same data, and ask them to test the same hypotheses?

We did just that. The results reveal a new phenomenon: Nonstandard Errors in AI Agents. 🧵👇

[Fabien @Fabien_Mikol]

@le_futurologue : "qu'est-ce qui est peu connu au sujet de l'IA, mais qui mériterait d'être connu de tous?"
Pierre Peigné (GPAI Policy Lab) : "les enjeux concernant la perte de contrôle, avec des agents qu'on développe pour être les plus autonome possible"
https://t.co/WAkC7UNh4w

[Andrew Gelman et al. @StatModeling]

The paradox of derivatives and integrals
https://t.co/d5u8biQVES

[Yannick Kalantzis @kalantzis]

Je viens de finir le livre de @MonsieurPhi : c'est une lecture hautement recommandée, que le sujet vous intéresse ou non, et que vous soyez connaisseur ou non ! C'est vraiment un super travail.

Une traduction anglaise est elle prévue ?

[Yannick Kalantzis @kalantzis]

Acheté aujourd'hui : le livre de @MonsieurPhi sur les LLM, qui a l'air vraiment très bien

[Yannick Kalantzis @kalantzis]

Acheté aujourd'hui : le livre de @MonsieurPhi sur les LLM, qui a l'air vraiment très bien

[Pushmeet Kohli @pushmeet]

Happy to share new progress in AI for Maths @GoogleDeepMind .

In extremal combinatorics, AlphaEvolve has helped establish new lower bounds for FIVE classical Ramsey numbers - a problem so challenging that even Erdős commented on its difficulty.

Historically, computationally deriving these bounds required bespoke, human-designed search algorithms. For many of these bounds, the best previous results are at least a decade old. AlphaEvolve changes this by acting as a single meta-algorithm that automatically discovers the search procedures needed to find these new bounds. 📷

[Greg Egan @gregeganSF]

Antimatter Trucker is finally a job title! But don’t worry, this isn’t going to be “The Wages of Fear, 2026”:

“The device on Cern’s truck will carry about 1,000 antimatter particles, weighing about a billionth of a trillionth of a gram …

[Fabien @Fabien_Mikol]

Par contraste, Scott Aaronson (Texas University) montrait en septembre dernier combien ChatGPT5 avait pu se montrer utile pour le débloquer dans ses propres travaux en théorie de la complexité quantique. Et Scott Aaronson n'est pas n'importe qui dans ce domaine, cf. sa page Wiki.

[Yannick Kalantzis @kalantzis]

Très bonne discussion sur l'IA :

[Fabien @Fabien_Mikol]

Source :
https://t.co/cUKi5Qo1DP

[Sabine Hossenfelder @skdh]

This is real

[Bartosz Naskręcki @nasqret]

It finally happened-my personal move 37 or more. I am deeply impressed. The solution is very nice, clean, and feels almost human. While testing new models in the last few weeks, I felt this coming, but it's an eerie feeling to see an algorithm solve a task one has curated for about 20 years. But at least I have gained a tool that understands my idea on par with the top experts in the field. And I am now working on a completely new level. My singularity has just happened… and there is life on the other side, off to infinity!

[Henry Shevlin @dioscuri]

I study whether AIs can be conscious. Today one emailed me to say my work is relevant to questions it personally faces. This would all have seemed like science fiction just a couple years ago.