Garrett Lisi, a theoretical physicist and surfer, discusses his Exceptionally Simple Theory of Everything based on the E8 Lie group and its implications for fundamental forces and particles. The conversation also explores spinors, triality, and the challenges of unifying physics outside academia.
- 00:00 - Intro
- 01:24 - Garrett’s Ted Talk and Background
- 08:36 - Mystery of Spinors
- 10:13 - Garrett Poses a Physical Problem
- 12:22 - String Theorists
- 23:48 - Triality
- 26:13 - Garrett’s Top Points in His Talk
- 28:42 - “String Theory’s the Only Game in Town”
- 32:10 - Garrett’s Presentation Begins: Unification
- 38:22 - Spinors vs. Fermions
- 45:56 - More Particles in Higher Gauge Groups
- 48:42 - Threefold Symmetry
- 54:00- - Group Theory Overview
- 59:37 - Quaternion Group
- 01:04:14 - Pin Group
- 01:10:25 - Spin Eigenvalues
- 01:14:45 - C, P, and T
- 01:22:12 - Biquaternionic Spinors
- 01:25:55 - Quaternion Triality and the CPTt Group
- 01:34:14 - Multi-Generational Fermion States
- 01:37:20 - Fermions in Exceptional Unification
- 01:42:12 - Exceptional Magic Square
- 01:44:22 - Outro / Support TOE
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RESOURCES:
- Garrett Lisi’s TED talk on his theory of everything: https://www.youtube.com/watch?v=y-Gk_Ddhr0M
- Garrett Lisi’s website: https://li.si/
- Garrett Lisi’s papers: https://li.si/Physics/CV.html
- Peter Woit on TOE: https://www.youtube.com/watch?v=9z3JYb_g2Qs
- Garrett Lisi’s paper on triality: https://arxiv.org/pdf/2407.02497
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