#998 overall
Stanford Topics in String Theory (Leonard Susskind)
YouTube
1 recommender · 1 thread · recommended in 1 year, 2019 · score 0.7
A Stanford lecture series by Leonard Susskind on topics in string theory, recorded for YouTube, covering black hole physics and related theoretical material such as Penrose diagrams and horizon behavior.
Commenters point to Susskind's lectures as a clear way to see black hole horizon physics illustrated with Penrose diagrams.
Science & Engineeringadvancedfreevideo lectures#string theory#black holes#penrose diagrams#general relativity#susskind
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I don't know if that's necessarily correct. From the point of view of an object falling through the event horizon, nothing special happens and they can look outwards normally; whereas an observer some distance from the black hole (and maintaining that distance) sees the falling object fall slower and slower and becoming more redshifted. The falling object also become shorter in the direction of travel (according to the external observer) and end up 'smeared' on the horizon.
Leonard Susskind shows this using a Penrose diagram in lecture 5 or 6 (I think, but they're all worth watching) of the Stanford Topics in String Theory lectures[1]
[1] https://www.youtube.com/watch?v=NZ-ElsvYKyo