Phymaths podcast # 71 || Dr. Tejinder Pal Singh

**Description** Dr. Tejinder Pal Singh is a theoretical physicist at the Tata Institute of Fundamental Physics, working on the unification of interactions using trace dynamics and octonions. A list of his works is linked below. **Some links** 1\) His works: https://inspirehep.net/authors/988555?ui-citation-summary=true 2\) Link to the high-energy physics resources page on my website: https://hassaansaleem.com/graduate-level-theoretical-physics-resources-in-progress/ **Contact Info** My website: hassaansaleem.com Follow on Instagram: https://www.instagram.com/hassaan.3142/ Join the WhatsApp channel: https://whatsapp.com/channel/0029Va9DkjmAzNbs7IlGuv1 Follow on Twitter: https://twitter.com/Hassaan\_PHY Email Queries: greatestmight@gmail.com **Time stamps** (0:00) Intro of the guest (0:16) His current projects (3:37) Octonions (13:57) Spacetime being classical (17:38) Structure of the Lagrangian and Connes time (22:50) Calculating path integral (33:21) Why octonions? (35:43) Role of SU(2) (39:57) Electroweak scale as QG scale? (46:17) Top quark problem (50:18) Fine structure constant (1:00:11) RG flow of Fine structure constant (1:02:45) (People's question) Advice for students (1:10:22) Anthropic reasoning (1:14:21) (People's question) AI's impact (1:17:29) (People's question) TIFR theory group (1:33:42) (People's question) Relativistic collapse models (1:38:45) (People's question) Thanu Padmanabhan (1:40:43) (People's question) John Baez's work