Nirmalya Kajuri
@kajunut.bsky.social
Assistant Professor of Physics at IIT Mandi and Science Writer. Writing a pop sci book about black hole information loss paradox.
If I have pain in my shoulders, it is because this Newton asshole kept standing on them: giant
Theoretical high energy physics ended today. Everyone saw Witten use Opus and decided to give up ⚛️
“Everything fits, nothing is broken, and I think that makes the puzzle that is our universe even better,” said Kokorev. science.nasa.gov/missions/web...
NASA Webb Finds Strongest Evidence Yet for ‘Black Hole Stars’ - NASA Science
The complex puzzle known as little red dots has become more complete since their initial discovery by NASA’s James Webb Space Telescope in 2022. Now a
science.nasa.gov
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.
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. ⚛️
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?
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.
⚛️🧪 If you don't like tree level Feynman diagrams for phi-cubed theory you can just
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!' ⚛️🧪
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-...
Einstein's Nemesis
Story of a genius who tried to disprove Einstein
nirmalyakajuri.substack.com
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-...
Einstein's Nemesis
Story of a genius who tried to disprove Einstein
nirmalyakajuri.substack.com
In 1939, Einstein wrote a paper which claimed that black holes cannot form. Even though his own theory of general relativity predicted their possibility, Einstein believed that they were bugs of the maths, not features of the world. In this paper, he set out to prove it. 🧵⚛️🧪
I wrote up a small observation I had on the interplay between symmetries and state-dependent operators. arxiv.org/abs/2604.03003
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...
arxiv.org
New preprint, with my students Arundhati Goldar and Rhitaparna Pal! We extend Grinberg-Maldacena's result that the boundary thermal one-point function encodes the bulk geodesic distance from boundary to singularity in AdS black holes, to 3D de Sitter black holes. arxiv.org/abs/2603.21425
Holographic One-Point Function and Geodesics in SdS$_3$
Grinberg-Maldacena showed that, for AdS/CFT, the thermal one-point function of a heavy boundary operator in the dual conformal field theory encodes the complex geodesic length from the boundary insert...
arxiv.org
My students printed out my General Relativity lecture notes from a few years ago and made this cover for it!
*Takes the tiniest possible bite* "That's a big bite!" If I didn't read the description, I would have thought this was a comedy skit
BladeoftheSun@bladeofthes.bsky.social · 5mo agoMcDonald’s CEO Chris Kempczinski tries his own burger, doesn't seem to have seen one before or know how to eat it. Takes one tiny bite definately doesn't want to eat any more. Probably because he knows what is in it.
Me: solve the equations x+y=5, x-y=3 Chatbot: (thought for 17 minutes) Simultaneous equations can be tricky. The equations you want solved are x+y=5, x-y=3. If we substitute x=z, y=w, the equations simplify to z+w=5, z-w=3. The next step would be to solve it. Just say the word. 1/3
Special relativity does not rule out faster-than-light signals? There's a strong argument showing that it need not. Hat tip to @uberwensch.bsky.social who shared a paper and initiated a discussion that inspired this post nirmalyakajuri.substack.com/p/faster-tha...
Faster than Light Travel, Free from Paradoxes
No grandfathers were hurt in the writing of this article
nirmalyakajuri.substack.com
Thinking about hanging this clock in my office to remind me of the problem of time in canonical quantum gravity
There's so many physicists here on Blusky yet I never see any real discussion or dialogue on any physics topic despite following the physics feed and every physicist in my areas of interest. Am I missing them? What can we do to spark some physics conversations? ⚛️🧪
Ravi Vakil on learning mimetically from seminars. The backfilling part is my favorite--it feels like a blurry picture finally coming sharply into focus!
From Akshita Mittal: Can a sneezing ant destroy a black hole? Regge and Wheeler set out to find out. ⚛️ 🔭 ☄️ 🧪 astrobites.org/2026/02/18/w...
What happens when you poke a black hole?
Can a sneezing ant destroy a black hole? Regge and Wheeler set out to find out.
astrobites.org
Drinking game for high energy physicists: While checking arXiv, take a shot whenever you encounter one of these terms Unparticles Chameleons Fakeons Spurions WIMPzilla Axions Relaxions Dark Photons Fuzzball Galileons Curvatons Ghost Condensate Cuscatons Fractons ⚛️🧪