): This is the fundamental object. It defines distances and "clocks" in a curved space.
However, the review also points out a few frustrating errors. For instance, the authors' discussion of the photon sphere—light rays orbiting a black hole—is mistakenly labeled an "Einstein ring," which is actually a weak-gravity gravitational lensing phenomenon. While these are minor blemishes, they serve as a reminder to always cross-reference concepts in a field as vast as physics. the theoretical minimum general relativity pdf
By utilizing the free lecture PDFs, video series, and official companion texts of The Theoretical Minimum , you can transition from a casual science fan to someone who truly understands the mathematical beauty of Einstein's universe. If you want to tailor your study plan, let me know: ): This is the fundamental object