Notes

from Dec, 2021

Kartik Prabhu
replied to a post on Twitter with
Here is a video from Segal’s talk at IAS https://www.ias.edu/video/wick-rotation-and-positivity-energy-quantum-field-theory
Kartik Prabhu
You can combine BMS symmetries and twistors into a BIG (infinite-dimensional) supersymmetry algebra. Out now at a local arXiv near you: https://arxiv.org/abs/2112.07186 Neveu-Schwarz supersymmetries make a cameo appearance, and there is a post-credit scene with spin-weighted spherical harmonics and Wigner 3j symbols!
Kartik Prabhu
replied to a post on Twitter with
“dinner salad” is for the heavily meat-based western diets. Growing up (in India) a typical dinner was rice/rotis, with some curried lentils, beans or chickpeas and some “drier” preparation of greens or peppers or root vegetables. Meat or fish was for sundays or special occasions
Kartik Prabhu
replied to a post on Twitter with
“Eternal Sunshine of the Spotless Mind” The best performances by Jim Carrey and Kate Winslet and basically everyone. I’ve watched it once and only once, but it is seared into my brain!
Kartik Prabhu
replied to a post on Twitter with
That list sounds like you are in your own bubble, like the string theorist bubble you complain of. There is a lot of important (and fantastic IMO) work by Wald (and collaborators), Zoupas, Hollands, Ishibashi; hell I’ll even put my own name in there and include @PhysicistBe
Kartik Prabhu
replied to a post on Twitter with
That is quite misleading! Abhay’s work on asymptotics at null infinity stands completely on its own without reference to any LQG stuff. In fact, it actually would be a nice project if someone wants to figure out the LQG version of asymptotic quantization!
Kartik Prabhu
replied to a post on Twitter with
It looks like Harvard has a very good PR department. The relation between memory, symmetries and infrared sectors were noted a long time ago in mathematical GR, especially by Ashtekar. High-energy folks simply ignored this; and now credit everything to Strominger. ¯\_(ツ)_/¯ Since I’m a scientist, I’ll cite my sources (note the dates) 1) A. Ashtekar, Asymptotic quantization of the gravitational field, Phys. Rev. Lett. 46 (1981) 573. 2) A. Ashtekar and K. S. Narain, Infrared Problems in Quantum Field Theory and Penrose’s Null Infinity, Syracuse University Report, Presented at the VIth International Conference on Mathematical Physics (1981). 3) A. Ashtekar, Asymptotic Quantization: Based On 1984 Naples Lectures, Monographs and Textbooks in Physical Science. Bibliopolis, Naples, Italy, 1987. 4) E. T. Newman and R. Penrose, Note on the Bondi-Metzner-Sachs Group, J. Math. Phys. 7 (1966) 863.