iiinova — where your digital self keeps evolving

Nirmalya Kajuri @kajunut.bsky.social · 08/10/2026

I guess chatgpt told him to fuck off with that crap

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Nirmalya Kajuri @kajunut.bsky.social · 08/10/2026

Raoul Bott's academic failson is spouting nonsense on X again

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Nirmalya Kajuri @kajunut.bsky.social · 08/10/2026

Yet their release claimed they were guided by the council. This sucks.

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Nirmalya Kajuri @kajunut.bsky.social · 08/10/2026

Would it not have been helpful for mathematicians and scientists if OpenAI's math drop came with better documentation about the process. What prompts were used, what checks done? I am a little surprised that the advisory council did not advise this

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Nirmalya Kajuri @kajunut.bsky.social · 07/10/2026

Just finished interviewing @preskill.bsky.social as research for my book. It was great!

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Nirmalya Kajuri @kajunut.bsky.social · 07/10/2026

Physicists are not always so serious. Niels Bohr loved Westerns (and famously came up with the gunslinger effect). Dirac was a big fan of Mickey Mouse. Some of Nambu's favorite books were the adventures of V. I. Warshawski—Sara Paretsky’s Chicago detective. Stephen Hawking loved The Simpsons.

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Nirmalya Kajuri @kajunut.bsky.social · 06/10/2026

The full story is that Dirac and his wife Manci had a disagreement over whether to watch a TV special featuring the pop singer Cher. Dirac resolved the argument by buying a second TV.

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Nirmalya Kajuri @kajunut.bsky.social · 06/10/2026

It sounds like a timeline glitch, but Paul Dirac bought a color TV just to watch Cher.

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Nirmalya Kajuri @kajunut.bsky.social · 05/10/2026

-quantum tunneling (Damour and Ruffini, 1977, also Parikh and Wilczek 1999) -Hadamard condition (Fredenhaagen and Haag, 1990) -gravitational anomaly (Robinson and Wilczek, 2005) Among others!

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Nirmalya Kajuri @kajunut.bsky.social · 05/10/2026

Hawking radiation can be derived via -Bogoliubov transforms (Hawking's original 1974 paper, Unruh 1976) -path integrals (Hawking and Hartle, 1976) -stress tensor in 2D (Davies, Fulling and Unruh, 1976) -conformal anomaly (Christensen and Fulling, 1977) -Euclidean BH (Gibbons and Hawking, 1977)

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Reposted by Nirmalya Kajuri

Jesse Berezovsky @jesseberezovsky.bsky.social · 04/10/2026

Teaching Modern Physics this semester and increasingly feeling like in physics there is this dogma that has been canonized over the years that we teach the students. But if you know where to look, you can find the apocryphal texts. 🧪⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 05/10/2026

When you ask for more money for fundamental research, funding agencies don't even say anything, they just look at you like this

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Nirmalya Kajuri @kajunut.bsky.social · 02/10/2026

We would conclude that we understood the analog system wrong. So what are they teaching us? Thoughts welcome. (One argument I have heard, but don't find too convincing, is that they demonstrate that transplanckian issues don't affect Hawking radiation)

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Nirmalya Kajuri @kajunut.bsky.social · 02/10/2026

I have a question about analog gravity/qft experiments: what do we learn from them about nature? The math of QFT in curved spacetime was never in any doubt, and that's the part these experiments test. Put different, a negative result won't lead us to conclude that we got QFT wrong. ⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 01/10/2026

Had a good time at RQI-N. Nice to get an overview of where the field of relativistic quantum information is at. Got a few ideas for future projects too!

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Nirmalya Kajuri @kajunut.bsky.social · 30/09/2026

I’ve worked in two areas—-loop quantum gravity and string/holography. One of these is stagnant and the other healthy. Hint: I no longer work on loop quantum gravity.

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Nirmalya Kajuri @kajunut.bsky.social · 29/09/2026

Put differently: if a field is healthy, its bottlenecks will keep shifting with time. Stagnant fields are stuck at the same bottleneck. The fashions in such fields are just new approaches to tackle the same problem. They fail, slowly fade out, and a new fashion takes its place.

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Nirmalya Kajuri @kajunut.bsky.social · 29/09/2026

A sure sign of a stagnant field is that fashions come and go, leaving no trace. Healthy fields are not immune to fashion, but some of them do end up transforming the fields, and future developments build on top of them. 1/2 🧪

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Nirmalya Kajuri @kajunut.bsky.social · 28/09/2026

The fields of relativistic quantum information and theoretical high energy physics have some overlap, but somehow the communities do not talk to each other as much as one might expect. So it is nice to attend RQI-N 2026 at IISER Mohali and learn about what they are up to.

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Nirmalya Kajuri @kajunut.bsky.social · 28/09/2026

I thought: who wouldn't, to meet a genius! Rafael was very generous with his time and over the next couple of days we had a long conversations about causal sets, other approaches to quantum gravity, and foundations of quantum theory. Rafael was a deep thinker and it was amazing, a cherished memory

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Nirmalya Kajuri @kajunut.bsky.social · 28/09/2026

Years ago, Rafael was visiting RRI Bangalore. I was a PhD student at the time. I travelled from Chennai to Bangalore (5 hrs by train) to talk quantum gravity with him. When I met them, his wife Fatma greeted me with "Oh you are the guy who travelled all this way to meet Rafael!" 1/2 ⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 13/09/2026

Deeply saddened to learn that Rafael Sorkin is no more. One of the deepest and most original thinkers of quantum gravity and the pioneer of causal set theory, he was also among the nicest, gentlest physicists I have met.

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Nirmalya Kajuri @kajunut.bsky.social · 10/09/2026

Rage against the machine meet rage against the dying of light.

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Nirmalya Kajuri @kajunut.bsky.social · 03/09/2026

With six research students, I don't get time to pursue projects of my own. This little paper happened when I sat down one evening and worked through an old idea. I didn't think it was significant enough to publish but with some encouragement I did put it out ⚛️ arxiv.org/abs/2604.03003

arxiv.org

Black Hole Interior Operators and Dilatation Symmetry in Planar Black Branes

Planar AdS black branes have a scaling symmetry that maps a brane solution at one temperature to a solution at another. It is natural to expect that boundary representations of bulk field modes should...

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Nirmalya Kajuri @kajunut.bsky.social · 30/08/2026

In case you guys are missing this stuff

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Nirmalya Kajuri @kajunut.bsky.social · 16/07/2026

If I have pain in my shoulders, it is because this Newton asshole kept standing on them: giant

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Nirmalya Kajuri @kajunut.bsky.social · 10/07/2026

I am at CERN. Come say hi if you are around ⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 08/07/2026

Heard they invented the www here or something ⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 25/06/2026

Theoretical high energy physics ended today. Everyone saw Witten use Opus and decided to give up ⚛️

Arxiv shows no new lisings in hep-th today

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Nirmalya Kajuri @kajunut.bsky.social · 10/06/2026

Haha got it! No, I have not finished the book. I read only up to the point where Penrose discovers singularity theorems, will finish the rest at some later point. What did you think of it?

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Nirmalya Kajuri @kajunut.bsky.social · 10/06/2026

Not yet. The book stuff is in the laptops. At this point I was about to do a pen-and-paper calculation, so the laptop was banished :)

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Nirmalya Kajuri @kajunut.bsky.social · 09/06/2026

New paper! Two recent approaches to black hole information loss paradox are islands and holography of information (HoI). We studied HoI in a 2d gravity model and investigated the difference between HoI and islands. Our result says that they correspond to different quantizations.

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Nirmalya Kajuri @kajunut.bsky.social · 04/06/2026

I know it's a bad time as most of you will be away for summer.

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Nirmalya Kajuri @kajunut.bsky.social · 04/06/2026

Planning to be in Europe in July but in a bit of a pickle with Visa issues. I booked my return on 30 July, but my visit to CERN ends on the 17th. I need an official invitation for the interim. If anyone in Schengen lands would beinterested to host me at their uni bw July 20-29, send me a DM. ⚛️

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Nirmalya Kajuri @kajunut.bsky.social · 24/05/2026

Real Estate Agent: It’s a wonderful neighbourhood. Very warm, very friendly. Everyone knows everyone, people are always dropping in, borrowing stuff, checking on each other. Honestly? It’s one of the most close-knit communities I’ve ever seen. Physicist (disappointed): So not Hausdorff?

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Nirmalya Kajuri @kajunut.bsky.social · 15/05/2026

Yes Saha was a Lok Sabha MP and Bose was a Rajya Sabha MP.

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Nirmalya Kajuri @kajunut.bsky.social · 11/05/2026

Paul Painlevé was a mathematician who served twice as the prime minister of France. Georges Lemaître was a pioneer of cosmology and also a Catholic priest. These days we have tech bruhs larping as physicists and mathematicians.

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Nirmalya Kajuri @kajunut.bsky.social · 06/05/2026

⚛️🧪 If you don't like tree level Feynman diagrams for phi-cubed theory you can just

image shows s-channel, t-channel and u-channel Feynman diagrams with a f in between, spelling stfu

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Nirmalya Kajuri @kajunut.bsky.social · 04/05/2026

(From Jagdish Mehra's obituary of Richard Feynman)

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Nirmalya Kajuri @kajunut.bsky.social · 04/05/2026

Pauli once told von Neumann the result of a difficult physical problem and how he had arrived at it. Von Neumann replied that the same result could be derived from just one axiom. Pauli responded, 'Herr von Neumann! If physics could be done with axioms, you'd be a great physicist!' ⚛️🧪

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Nirmalya Kajuri @kajunut.bsky.social · 04/05/2026

So Datt had done the main technical part of O&S earlier than them, but did not connect it with collapse of a star. But O&S also matched the solutions across the shell and described the physical process of collapse.

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Nirmalya Kajuri @kajunut.bsky.social · 04/05/2026

Very little is known about Datt. He died at an early age from a failed operation. However, his paper was not about collapse. What he did was to solve Einstein's eqn outside a contracting shell. O&S studied the collapse of a star which they modeled by a contracting shell

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Reposted by Nirmalya Kajuri

Nirmalya Kajuri @kajunut.bsky.social · 28/04/2026

The man who ensured Einstein never won a Nobel prize for relativity was an eye doctor. Ironically, he ended up making an important contribution to Einstein’s theory. This is the story of Allvar Gulstrand ⚛️🧪 nirmalyakajuri.substack.com/p/einsteins-...

nirmalyakajuri.substack.com

Einstein's Nemesis

Story of a genius who tried to disprove Einstein

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Nirmalya Kajuri @kajunut.bsky.social · 28/04/2026

nirmalyakajuri.substack.com

Einstein's Nemesis

Story of a genius who tried to disprove Einstein

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Nirmalya Kajuri @kajunut.bsky.social · 01/05/2026

Experimental proof was established by Eddington in 1919.

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