The existence of Ringo Starr implies the existence of ringing black holes. ⚛️🧪

4459 Scientists from around the world have signed a statement on Gaza. The list includes 14 Nobel Prize winners, 5 Fields medalists, 21 Breakthrough Prize winners, and 34 Dirac Medalists. t.co/bSC7HmJdso

Hey, I'm not saying this is the single greatest astronomy book ever written. I'll let others come to realize that on their own.

Motivated by @seanmcarroll.bsky.social 's thread about his ongoing QM course, I am also going to maintain an online journal here of my ongoing course "Special Topics in Quantum Mechanics." ⚛️🧪🧵

Very cool

Math books are like Examples of group: Example 1: Integers under addition Example 2: Tarski Monster group 🧪⚛️

🙂

Tim Nguyen breaks his silence on the Eric Weinstein episode. Highlights: EW implying legal action against a podcast Tim critiqued GU in, Curt Jaimungal revoking his invitation to Tim, Sabine deleting Tim’s post from her blog but Lex Fridman cancelling EW timothynguyen.org/2025/08/21/p... ⚛️🧪

This week's post is about why spherical cows are physics' mascot ⚛️🧪 open.substack.com/pub/nirmalya...

This week's post is about why spherical cows are physics' mascot ⚛️🧪 open.substack.com/pub/nirmalya...

Great thread on resurgence!

Boiling a black hole

Thanks @mmylova.bsky.social for creating the Cosmo feed! It's really improved my Bsky experience. Suggest others to follow it too: bsky.app/profile/mmyl...

Nice thread about Robertson and Walker of the FRW model, with a cameo from Fermi!

New post on the occasion of Roger Penrose's birthday. Happy Birthday, Sir Roger! How Roger Penrose trapped the Singularity open.substack.com/pub/nirmalya...

When Ed Witten is your TA (From Zee's QFT in a nutshell) ⚛️

We mock flat earthers, but there are many examples where people mistake linearizations for the full story, and are still taken somewhat seriously. 🧪

I am not a big newsletter subscriber (even though I have a sporadic one of my own) but check out @kajunut.bsky.social‬'s new Substack for the good oil on the status of string theory and fun facts about high energy physics physics nirmalyakajuri.substack.com

String theory at LHC? New post over at substack. open.substack.com/pub/nirmalya...

“I have lost valuable information, Mr. Marlowe,” she said, “at a joint they call the Black Hole. I need you to get it back for me.” A chill went down my spine like a trickle of liquid Helium.

Should interpretations of quantum mechanics be taught in quantum mechanics courses? If so, how long should the instructor spend on interpretations-- just a brief mention, or one or more lectures? 🧪⚛️

Loeb: we must stick to the facts, not judge things based on public opinion. Also Loeb: Look at how many likes and messages my ideas get! I must be doing it right.

Christian Ferko, Hassaan Saleem and I went to Sam Gregson's Bad Boy of Science propaganda to talk about string theory, geometric unity and Sabine Hossenfelder's bizarre attempts to equate the two youtu.be/213qm_KTJkQ?... ⚛️🧪

I have been in the PI business long enough to know she was trouble the moment she walked in. “Have a seat” I told her. But she fidgeted like a cat on a hot tin roof, never at one place. “I have lost some valuable information” she said, “at a joint they call the Black Hole.” 🧪⚛️🧵

Being a scientist means contemplating the breathtaking mysteries of nature with profound wonder, and asking "Can I get a paper out of this?" 🧪

Stephen Hawking was so good at computing path integrals in his head that someone gushed to Feynman about how impressive his feats were. Not quite as impressive as inventing path integrals, pointed out Feynman, who had invented path integrals. 🧪⚛️

Sabine on normal scientists: grifters misleading the public for money Sabine on Avi "alien hunter" Loeb: a little too eager ⚛️🧪

There's always that one guy in the audience

Bit of academic lore about me. I discovered a fatal error in my thesis *after* having submitted it. nirmalyaphysics.wordpress.com/2022/08/13/h...

Going on Jubilee with 20 people who use the +--- metric ⚛️

New post! 🧪⚛️ open.substack.com/pub/nirmalya...

⚛️ David Tong goes to a doctor. David: I am not feeling too good, doc. Trying to learn a new area of physics but somehow can't get into it. Doc: The solution is simple. There is this guy who writes the best physics lecture notes..

⚛️🧪

You’ve heard of water boiling into steam. But have you heard of hot gas boiling into a black hole? In 1983, Stephen Hawking and Don Page discovered the phenomenon of Hawking-Page transition🧵

⚛️ Some people keep roses, some people

I have started a substack. My first post is based on my last two threads here. Do check it out: open.substack.com/pub/nirmalya... 🧪⚛️

A thread 🧵on how string theory led to the uncovering of a relation between gauge theories and gravity which is still a mystery. No, it is not gauge/gravity duality again. I am talking about the puzzle that is the double copy relations. 1/n ⚛️🧪

Harvard astrophysicist strikes again 🧪

Youtubers: Fundamental physics has stagnated!! Me: I wish it had, it would not have been a full time job just to catch up! ⚛️

Emergence, like fluid dynamics emerging from large numbers of atoms, is pretty familiar. Two descriptions of the same system, but one is approximate and higher-level. Duality is weird. Two descriptions of the same system, but both descriptions are precisely as good. Nothing approximate about it.

A thread on how gauge/gravity duality tells us to take string theory very seriously. ⚛️🧵 No its not the usual holographic universe argument. Let us start with a quick intro to the duality from that noted string diehard, Sabine Hossenfelder

Sabine Hossenfelder dropped this gem today, in response to my post on X. The context here is Weinstein's GU having anomalies. That second sentence is incredible. A classical theory develops issues when you try to quantize it? Well have you considered that quantum theory is not fundamental? ⚛️

Very excited about the "Special Topics in Quantum Mechanics" course I am going to teach in the next semester. Will include isolated and open systems, symmetries in QM, groups and representations, identical particles, Bell's inequality, dense coding, scattering, among other topics. ⚛️

I recently gave a popular level talk on the history and mystery of black holes to students of IITB. The talk covered: History of black holes Understanding black holes with Penrose diagrams Black hole information loss paradox Give it a listen! www.youtube.com/watch?v=i4qO...

Ed Witten once asked a friend of mine how many languages India has and this guy replied 10^500

A confused journalist once asked physicist CV Vishveshwara how he was related to S Chandrasekhar. Vishveshwara replied "We are relativists, not relatives!" ⚛️

⚛️ Physicist Herman Bondi was asked why he left active research to become the scientific advisor to the British government, even though he made many fundamental contributions to the theory of relativity. His reply 👇

Paper alert. A smol paper with my students Rinkesh and Waheed arxiv.org/abs/2506.23035

Should I read Malazan Book of the Fallen series

📚 Book deal Alert 📚 I have signed with @harvardpress.bsky.social to write a deep dive on the the universe's greatest locked room mystery--the black hole information loss paradox. 🧪⚛️