I Ta-Pei Cheng's "Relativity & Cosmology" Course on YouTube

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Ta-Pei Cheng's "Relativity & Cosmology" course on YouTube offers a comprehensive exploration of advanced topics in physics. The course is accompanied by a well-regarded textbook on gauge theory co-authored by Cheng and Li, which is recognized as a standard reference. The lectures are aimed at those interested in deepening their understanding of relativity and cosmology. The YouTube channel features organized playlists for easy navigation of the content. Overall, this course presents a valuable resource for students and enthusiasts of theoretical physics.
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I know the book on gauge theory by Cheng and Li which is a good standard textbook.
 
Moderator's note: Spin-off from another thread due to topic change. In the second link referenced, there is a claim about a physical interpretation of frame field. Consider a family of observers whose worldlines fill a region of spacetime. Each of them carries a clock and a set of mutually orthogonal rulers. Each observer points in the (timelike) direction defined by its worldline's tangent at any given event along it. What about the rulers each of them carries ? My interpretation: each...

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